Thanks, David. Today I will start with our first quarter financial results, our second-quarter 2015 outlook and then I'll wrap up with a discussion of our financial position and some closing comments. As noted in our press release, earnings from continuing operations, adjusted for other expense of $0.11 per share to refinance debt, increased 18% from last year to $1.49. Total first quarter revenue increased 9% to $1.16 billion from a year ago, primarily due to more operating days as we added three new jack-ups and reinstated three upgraded floaters. These results reflect the strong operational and safety performance and expense management that our offshore crews and onshore personnel delivered during the quarter. Floater segment revenue grew 7% to $695 million versus prior year as the ENSCO 5004, 5005 and 5006 returned to the operating fleet after completing shipyard upgrades. As a result, reported floater utilization increased to 86% from 75% a year ago which more than offset a 9% decline in the average day rate to $425,000 per day. Operational utilization for the floater segment which adjusts for uncontracted days and planned downtime, was 93%, compared to 95% a year ago. Jack-up segment revenue grew 7% to $428 million as we added ENSCO 120, 121 and ENSCO 122 to the active fleet. These jack-ups had exceptionally high uptime performance of nearly 100% in the first quarter. Reported utilization for the jack-up fleet was 87% compared to 86% a year ago and the average day rate increased 7% to $144,000. The addition of three ENSCO 120 series rigs to the fleet contributed to the increase in average day rates. Operational utilization for the total jack-up fleet was an impressive 99.6%, the highest level that we've achieved in the past three years. First quarter total contract drilling expense decreased to $518 million from $520 million a year ago. Proactive expense management, including lower compensation and repair and maintenance costs, more than offset $45 million of additional contract drilling expense related to growth in our operating fleet. Depreciation expense increased $6 million to $137 million, in line with our expectations, due to adding rigs to the active fleet. General and administrative expense for the quarter was $30 million, also in line with our outlook and $8 million less than a year ago, primarily due to lower discretionary compensation and disciplined expense management. As detailed in our press release, other expense increased to $73 million from $29 million a year ago for two key reasons. Costs related to refinancing our 2016 debt maturities increased other net by $27 million, as shown in our earnings release; and interest expense was $18 million higher year to year, mostly due to our $1.25 billion debt raise during third-quarter 2014. Now, let's turn to our outlook for the second quarter. Total revenues are expected to decline from first quarter results of $1.16 billion as lower reported utilization and average day rates across the fleet are expected to more than offset a full quarter of operations for ENSCO 5006. For our entire fleet in continuing operations we expect reported utilization to be in the high 70% range, compared to 86% in the first quarter. Average day rates are projected to decline by approximately 5% from first quarter levels of $244,000. We anticipate second-quarter contract drilling expense will increase approximately 2% from $518 million in the first quarter, primarily due to more operating days from ENSCO 5006; and approximately $18 million of upfront expenses to cold stack rigs which will reduce operating costs on these rigs in future periods until they are reactivated. Here is a breakdown of costs to complete the preservation process for cold stacking. Approximately $2 million in total for four jack-ups, plus approximately $8 million each for ENSCO 8501 and 8502. These costs are significant because our stacking process for these floaters involves careful preservation, including dehumidifying key equipment and preventing corrosion of the hull. We expect second quarter G&A expenses to be in line with the first quarter. Depreciation expense is expected to increase to $141 million as ENSCO 5006 operates for a full quarter. In total, other expense is estimated to be $54 million in the second quarter. This breaks down as follows; interest expense of $51 million, interest income of $3 million and other expense of $7 million due to the retirement of the remaining 2016 maturities that were not fully tendered during the first quarter, plus the retirement of some smaller debt maturities. Now, I will provide an update on the cost reduction plans announced on our last call. The cold stacking process for ENSCO 8501 and 8502 is expected to be completed by the end of the second quarter, at which time cash costs for these 8500 series rigs will be less than $10,000 per day. Cash savings will be approximately $120,000 per day. The cold stacking process for four jack-ups, three in the U.S. Gulf of Mexico and one in the Middle East, is also expected to be completed by midyear. Once cold stacked, cash costs for these rigs are expected to be less than $5,000 per day with cash savings of approximately $40,000 per day. We remain on target for a 9% reduction in average offshore unit labor costs from 2014 levels beginning in second quarter 2015. As a reminder, this will translate into meaningful cost savings since about half of 2014 contract drilling expense of $2.1 billion was offshore compensation. Earlier this year we reduced onshore personnel by 15% company-wide. Annualized savings from this workforce reduction is expected to be $27 million beginning in second quarter 2015. We're also negotiating cost reductions with vendors and suppliers that are expected to reduce expense and capital expenditures going forward. So let's wrap up with a review of our financial position. We have the highest credit rating among the major offshore drillers, with investment-grade ratings from both S&P and Moody's; $8.4 billion in revenue backlog based on contracts in place; $1.6 billion of cash and short-term investments; a net debt-to-cap ratio of 31%; and, by virtue of our recent debt refinancing, no significant debt maturities until 2019, plus a fully available $2.25 billion revolving credit facility, giving us sufficient liquidity and capital management flexibility. We expect capital expenditures for the remainder of 2015 to be approximately $1.7 billion, including $1.35 billion in newbuild capex, $175 million for rig enhancement projects and $175 million for sustaining projects. As we look ahead, we project total 2016 capex to be less than $1 billion. In conclusion, I want to emphasize our focus on the controllable aspects of our business during the current downturn. We remain committed to proactive cost control, including an aggressive expense- and cash-management program that will drive sustainable cost reductions. For example, we will continue to stack rigs rolling off contracts that do not have near-term contracting opportunities with customers. Our recent actions in the capital markets have further strengthened our liquidity and capital position, giving us more flexibility to navigate the downturn. We have maintained our strong investment-grade credit ratings, something that Ensco has always believed is strategically important, especially during a downcycle; and we're the highest rated company in our sector. This will allow us to focus on further improving operational, safety and financial performance, better positioning Ensco in the near term and for the inevitable up cycle. So with that, I'll turn the call back over to Sean.