Thanks, Paul. Now let's discuss the details behind our fourth quarter results. We reported Q4 adjusted EPS of $0.49 and adjusted EBITDA of $38 million. These results reflect outperformance in the level of paid worksite employees compared to our expectations in the continued uncertain and challenging business environment. Upside in our direct cost programs brought about by the structure and the ongoing management of these programs and some dynamics related to the pandemic and continued management of our operating costs. As for our growth, we continued the sequential increase in paid worksite employees since the low point in May of 2020, when the impact of the pandemic caused many of our clients to furlough or permanently lay off their employees. Our recovery in the level of paid worksite employees since this period was driven by the return to work of many of these employees and effective selling and client retention. Q4 average paid worksite employees increased 3% sequentially over the Q3 period, coming off the 2% sequential increase in Q3 over Q2. During Q4, all 3 growth drivers exceeded our expectations. Gross profit increased by 3.5% over Q4 of 2019, despite 1.8% fewer paid worksite employees due to improved pricing and the higher-than-expected contributions from our benefit and workers' compensation programs. During Q4, total benefit costs returned closer to pre-pandemic levels as lower health care utilization was largely offset by COVID-19 testing and treatment costs. However, previously deferred care costs did not materialize at the forecasted level. Our workers' compensation program continued to perform well due to ongoing management of safety practices and claims, and to a lesser degree, a favorable net impact from the reduction of workers' compensation claims associated with the work-from-home status of many of our clients' employees. Now turning to operating expenses. We continue to manage costs commensurate with the current operating environment, while also investing in our long-term growth plan. Operating expenses, excluding stock-based compensation and depreciation and amortization, increased just 5% over Q4 of 2019. Fourth quarter operating expenses included costs associated with a 9% increase in the average number of trained business performance advisors and the opening of 6 new sales offices throughout 2020. We held other corporate employee headcount flat over the past year due in a large part to the effort and the effectiveness of our staff in the face of increased HR service demands from within our client base. Cost savings continue to be realized in other areas of the business, both through effective management and because of pandemic related cancellations or shutdowns. These areas include G&A costs such as travel and training and costs associated with certain sales and marketing events. The Q4 year-over-year increase in total operating expenses of 19% was impacted by increased stock-based compensation costs. This increase was driven primarily by our outperformance and the level of paid worksite employees and earnings in the face of the significant challenges brought about by the pandemic. Now turning to our full year 2020 operating results, adjusted EBITDA increased 15% over 2019, $289 million, and adjusted EPS increased 12% to $4.64. The average number of paid worksite employees for the full year 2020 declined by less than 1% in a very challenging environment. Worksite employees paid from new sales declined by only 1.5% from 2019, largely on the success of our remote selling. Client retention averaged 82% due to the resiliency of our clients and our quick and effective response to assist our clients with our premium level of HR services. These same factors contributed to our clients' ability to return a significant amount of their initially furloughed staff to a full-time status and clients in certain industries adding to their employee base over the course of the year. Gross profit increased 10% over 2019 as improved pricing and the favorable impact of our benefit and workers' compensation programs more than offset the slight decline in paid worksite employees and the comprehensive service fee credits provided to our clients during Q2. Lower healthcare utilization brought about by the pandemic resulted in 2020 benefit cost per covered employee being relatively flat compared to 2019. This compares to our original pre-pandemic 2020 budget, which anticipated a cost increase of approximately 3%. Now as you may recall, we were targeting benefit pricing increases slightly above the 2020 budgeted cost trend to address increased costs associated with 2019's elevated large claim activity. We ended 2020 slightly exceeding these pricing targets. Now operating expenses, excluding stock-based comp and depreciation and amortization, increased by just 5.5% in 2020 over 2019 as growth, product and technology investments were partially offset by cost savings in the other areas that I mentioned a few minutes ago. Total operating expenses increased 12% over 2019 and included the increase in stock-based comp tied to our outperformance. Our execution, combined with the dynamics of the pandemic, produced strong cash flow over the course of 2020. We ended the year with a solid balance sheet, while continuing to invest in the business and providing strong return to our shareholders. We invested $98 million in capital expenditures during the year to support our recent and future growth, and returned $161 million to shareholders through our dividend and share repurchase programs. We repurchased a total of 1.4 million shares during 2020 at a cost of $99 million; increased our dividend rate by 33% in February; and paid out a total of $62 million in dividends. We ended the year with $212 million of adjusted cash and $130 million available under our $500 million credit facility. Now let me provide our 2021 guidance, which incorporates wider than usual growth in earnings ranges, given the ongoing uncertainty in the macro environment. As for our growth metric, we are forecasting a 2% to 6% increase in the average number of paid worksite employees for the full year 2021. We expect to begin this year with a 1.5% to 2.5% decline in Q1 when compared to the pre-pandemic 2020 period. The sequential decline from Q4 of 2020 includes the loss of the large account, which Paul just mentioned. Now subsequent to Q1, our growth is expected to be driven by the recent growth and tenure in the number of trained business performance advisors, continuing solid core client retention and modest net hiring in our client base, brought about by a gradual improvement in the business environment. Our range of forecasted growth is largely dictated by the timing and degree of such an improvement, and its impact on the 3 drivers of our growth. As for our gross profit area, you may recall that our key metric is gross profit per worksite employee per month, which takes into account our co-employment service fee pricing; the pricing and cost management of our direct cost programs, including benefits, workers' compensation and payroll taxes; along with contributions from our traditional employment and other products. It may be helpful to begin our discussion with the review of recent history to gain some perspective on how we are currently reviewing 2021. This metric averaged $261 in 2017; $272 in 2018; $259 in 2019; and $287 in 2020. Now let's take a few minutes to break down some of the details as we look at our expectations for 2021. Our co-employment service fee pricing is expected -- is impacted by new and renewal pricing and any changes in client mix. This pricing remains strong throughout 2020 and throughout the recent sales and renewal period. And we combined with our pricing targets over the range of 2021 and a favorable client mix impact from the loss of the larger lower-priced account, we expect our overall service fee pricing to improve over 2020. Also, you may recall that comprehensive service fee credits were provided to our clients in Q2 of 2020, which is lower than the prior year's overall service fee. We expect a more normal overall benefit cost trend in 2021 when taking into account the expected increase in health care utilization over the course of the year and our best estimate of COVID vaccination and treatment costs. When you consider the flat cost trend in 2020, this would equate to an expected 2021 cost increase of 6% to 7%. This includes an outsized Q2 year-over-year increase, given the extraordinary low claims in Q2 of 2020. Now if you take a step back to 2019, this equates to annualized cost trends of approximately 3% from 2019 through 2021. Since we have taken a steady approach to pricing over the last 2 years, we believe we have effectively matched our pricing with this 2-year cost trend. However, this is still -- there is still a considerable amount of uncertainty around benefit utilization and COVID case count treatment and vaccines. This uncertainty contributes to a wide normal range in our earnings guidance. As for our workers' compensation cost area, we have experienced improving cost trends over recent years from ongoing management of client selection, safety and claims. Similar to prior years, we intend to budget 2021 conservatively and allow for these factors to possibly drive additional cost benefit throughout the year. As for the payroll tax area, we're projecting an increase in state unemployment tax rates as a result of the pandemic’s impact on unemployment. Many states have issued rules to exclude COVID-related unemployment claims from the employers’ 2021 [season] rate. However, as we sit here today, the majority of these states have not yet finalized their rates. Accordingly, in an effort to estimate our 2021 rates, we have communicated with certain larger states to verify their intentions and perform detailed analysis and modeling. We have incorporated these estimated rates in our outlook, and we expect this area to have a $1 reduction in gross profit per worksite employee per month for the full year 2021 and a $5 reduction in Q1 2021 due to the seasonality of our unemployment taxes. So as for the bottom-line, when you combine each of these factors, we are budgeting gross profit per worksite employee at a level closer to 2018 than even to the high point of 2020 or the low point of 2019. Now as I mentioned earlier, in addition to the upside in the gross profit area in 2020, we also managed operating costs significantly below our 2020 budget. Our overall 2021 operating plan balances maintaining certain costs at 2020 levels, with investing in targeted initiatives important to our long-term growth. With the growth in the number of BPAs throughout 2020 and their increased tenure, we intend to manage the growth in a number of hired BPAs to about 4% in 2021. We intend to manage other corporate headcount to a 2% increase. We are budgeting for a return in 2021 of a portion of marketing and business promotion costs which were not incurred in 2020 due to the pandemic shutdown. We have also increased our lead generation budget. As for our G&A costs, we experienced significant savings during 2020, particularly in the area of travel and training. We plan to continue to manage these costs at this lower level and will assess the opportunity and need for any increased activity as pandemic conditions improve. Now as Paul just mentioned, an important initiative this year is the purchase and implementation of Salesforce. Our 2021 budget includes the product and estimated implementation cost associated with this effort. During the implementation phase, we will experience some duplication in cost while still using our current sales and service software. However, after implementation, any incremental costs over and above our current software solutions are expected to be minimal. As for 2021, we are budgeting for approximately $6 million in incremental costs related to the Salesforce initiative. So in considering all these factors, we are budgeting for a 4% increase in cash operating costs in 2021 over 2020. As for our non-cash items, we have budgeted for a decrease in stock-based compensation when compared to 2020, due to the performance-based feature of our stock awards and a setting of new targets for the 2021 year. We have budgeted for a $10 million increase in depreciation and amortization over 2020, associated with software development costs related to the recent improvements in our payroll and HCM system, which were previously capitalized and the recent expansion of our corporate facility. So in conclusion, we are forecasting improved worksite employee growth of 2% to 6%, combined with lower gross profit per worksite employee and a slight increase in cash operating costs per worksite employee. Given the continued uncertainty in the macro business environment, we believe it's prudent to forecast a wider than typical range of $225 million to $275 million in adjusted EBITDA. As for adjusted EPS, we are forecasting full year 2021 in a range of $3.27 to $4.20. This assumes an estimated tax rate of 26.5%, generally consistent with our 2020 rate and the increase in depreciation and amortization that I just discussed. We are forecasting Q1 adjusted EBITDA in a range of $84 million to $103 million and adjusted EPS from $1.37 to $1.72. As for our quarterly earnings pattern, keep in mind that our Q1 earnings results are typically higher than subsequent quarters. In particular, we typically earn a higher level of payroll tax surplus prior to worksite employees reaching their taxable wage limits, and benefit costs are lower in Q1 and step up over the remainder of the year as deductibles are met. Now at this time, I'd like to open up the call for questions.