Elizabeth Boland
Analyst · Barclays
Thanks. So again, to recap a couple of the figures that Dave reviewed. Our top line revenue growth in the first quarter was $18 million. The Full Service Center business added $13 million on rate increases, enrollment gains in our ramping centers as well as the mature class and contributions from the 35 new centers that we have added since Q1 of 2014.
As Dave mentioned, the pound and euro FX rates declined measurably in Q1 2015 compared to Q1 2014, which dampened our revenue growth in the Full Service segment by more than $6 million or approximately 2 percentage points. On a common currency basis, therefore, the Full Service segment growth was nearly 7% in the quarter. The impact of centers that we have closed since the beginning of last year also offset top line growth in Full Service by about 2 percentage points.
The Back-Up division and Ed Advisory Services continue to grow the top line from both new clients as well as from expanded utilization of services by the existing client base. They also enjoy a rate increase in the same range of 3% to 5% -- 3% to 4%, excuse me. For Ed Advisory, in addition to the normal seasonality that we see from Q4 to Q1, the Q1 2015 revenue growth rate of around 11% reflects that slight variability that occurs in connection with the timing of our new client launches and the associated implementation phase of contracts that Dave discussed a minute ago. Gross profit increased $9.5 million to $87 million for the quarter. And gross margin was 24.7% of revenue, up 150 basis points in 2014 -- from 2014. As we've seen in prior quarters, our Back-Up and Ed Advisory Services both continue to deliver strong margin performance in concert with their revenue growth. In addition, both of these businesses generate gross margins that are more than double what we earn in the Full Service business.
On the Full Service side, performance also remained strong in our mature and ramping class of centers. The steady pace of year-over-year enrollment gains in the mature class that we've seen since 2011 has also continued into early 2015, and we realized over 1.5% increase in enrollment for that class in Q1. Strong cost management alongside this enrollment growth, plus the exit from underperforming locations, also contribute to the margin expansion.
As we've talked about on previous calls, we're now realizing the contributions from those investments that we made starting in late 2012 in our lease/consortium growth strategy. We've opened 30 of these centers over the past 2 years and expect to add 15 to 20 more in 2015. Although we expect to incur roughly similar level of losses from this group in 2015 as we incurred over the last 2 years, so in the range of $8 million to $10 million per year, we expect the headwind to gross margin to abate in the latter part of 2015 as the 2013 class will be generating gross profit at near-mature contribution level and the 2014 class continues to ramp their enrollment.
Overhead for the quarter was $37 million compared to $35 million in 2014 and was approximately 10.5% for both periods, adjusted to exclude the $500,000 in transaction costs associated with the secondary offering that we completed in March of 2014. Over time, with more scale in our European operations and our Ed Advisory business, we expect to be able to leverage our overhead spend in investments to support growth at levels that are similar to the 20 basis points that we realized in 2014.
Turning to a couple of other lines on the income statement. Interest expense of $10 million in Q1 of '15 reflects the full quarter impact of $165 million of incremental term debt that we borrowed in mid-December of 2014, which we used to fund the repurchase of 4.5 million shares acquired in connection with the secondary offering that we also completed in mid-December. We ended the quarter with 3.4x net debt-to-EBITDA, a reduction from the 3.6 turns (sic) [3.6x] that we reported at 12/31 of '14. And we expect to further reduce that ratio through EBITDA growth throughout the rest of this year. The effective restructural tax rate of 35.5% in Q1 of 2015 is based on the applicable rate for our projected full year 2015 operating performance.
Turning to the cash flow statement. We generated operating cash flow of $47 million in the quarter compared to $52 million in 2014, with the slight decline there due primary to the timing of collections and payments in working capital. After deducting maintenance CapEx, our free cash flow totaled $40 million for the quarter, and we ended Q1 of '15 with $124 million in cash and no borrowings outstanding under our revolving credit facility.
I'll quantify our quarter-end statistics before turning to our outlook for the rest of the year in Q2. At March 31, we operated 885 centers with capacity of 101,500, which is an increase of 1.8% over a year ago. The mix of contract types remains consistent, 75% profit and loss arrangements and 25% cost plus contract, as is the average full center -- Full Service Center capacity, which is 137 in the U.S. and 78 in Europe. As Dave previewed, our outlook for the full year 2015 anticipates revenue growth of approximately 7% to 10% over 2014.
Growth breaks down as follows: organic growth approximates 8% to 10%, including 3% to 4% price increase, 1% to 3% from growth in enrollment in our mature and ramping centers, 1% to 2% from new organic Full Service Center additions and 1% to 2% from our Back-Up and Ed Advisory services. In addition, acquisitions add approximately 1% to 2%. Offsetting these increases are the effects of center closings, which can include both legacy organic and acquired centers, of approximately 2 percentage points and projected reductions from foreign exchange to rate differences of also approximately 2%. Both of those primarily affect the Full Service segment.
We're planning to add a total of 45 to 50 new centers, including organic new and acquired centers. And our current outlook also contemplates closing approximately 25 to 30 centers, including the handful of underperforming centers acquired as part of the groups that we added in 2013. We expect that income from operations in 2015 will expand approximately 100 to 125 basis points from the 11.1% adjusted income from operations that we reported in 2014, primarily on gross margin expansions and secondarily from a bit of modest overhead leverage.
For the full year, we expect amortization in the range of $28 million to $29 million; depreciation of approximately $55 million to $57 million; stock compensation of approximately $9 million; and interest expense in the range of $41 million to $42 million for the year, assuming continued 4% to 4.5% borrowing rates on our term loans and no borrowings required under the revolver based on our expected cash flow generation.
We now estimate, as I mentioned before, that the effective restructural tax rate will approximate 35.5% of our adjusted pretax income in 2015, which is broadly consistent with the 2014 full year rate and the projected GAAP reported effective rate for the rest of 2015.
Combination of top line growth and operating margin leverage drive adjusted EBITDA in the range of $270 million to $275 million for the full year 2015 and adjusted net income in the range of $110 million to $112 million. The share buyback that we completed in December of 2014 adds roughly $0.03 to $0.04 a share to EPS after considering the incremental interest expense on the term debt, but this is offset by the projected foreign exchange impact that we talked about.
One other element, though, that we're noting this quarter is that the lower tax rate contributes to modest EPS expansion. And so as a result, we now estimate that the adjusted EPS will increase to a range of $1.74 to $1.77 in 2015.
Lastly, for the year, we're estimating weighted average shares to range between 63.5 million and 64 million shares. On the cash flow side, we project that we'll generate approximately $180 million to $190 million of cash flow from operations, which translates to $145 million to $155 million of free cash flow net of the projected maintenance CapEx spending of around $35 million.
Based on the centers in development and slated to open in 2015 and early 2016, we expect to invest approximately $50 million to $55 million in the new center capital and $25 million to $30 million on acquisitions. We expect to fund all of these investments from operating cash and would end the year with $140 million to $150 million cash on hand.
Looking specifically to Q2 of 2015. We expect our top line growth to continue to be in the range of 5% to 7%, including the impact of the lower foreign exchange. Our outlook for the adjusted EBITDA approximates $72 million to $74 million and for adjusted net income in the range of $30 million to $31 million. With approximately 63.5 million shares outstanding, this would translate to adjusted EPS in the range of $0.48 to $0.50 a share for the second quarter of 2015.
So with that, Jerry, we are ready to go to Q&A.