Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 8,118	$ 5,974
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,572	9,859
Amortization of deferred financing costs and debt discount	170	185
Equity-based compensation	6,001	1,965
Provision for doubtful accounts	101	151
Loss (gain) on disposal of property and equipment	18	(46)
Deferred income taxes	(1,204)	1,221
Changes in assets and liabilities:
Accounts receivable	(3,345)	(10,691)
Other receivables	(249)	367
Prepaid expenses and other assets	(584)	(3,727)
Accounts payable	(3,258)	(7,762)
Accrued payroll and related liabilities	(5,775)	(4,852)
Accrued expenses and other liabilities	239	41
Deferred revenue	12,049	15,818
Income taxes receivable	7,379	2,896
Net cash provided by operating activities	31,232	11,399
Investing activities
Purchases of property and equipment	(6,014)	(2,726)
Net cash used in investing activities	(6,014)	(2,726)
Financing activities
Payments on long-term debt	(2,313)	(1,070)
Deferred financing payments		(50)
Payments on capital lease obligations	(402)	(1,722)
Proceeds from sale of equity interests		100
Purchases of equity interests	(473)	(731)
Taxes paid for net settlements of restricted stock vesting	(633)
Net cash used in financing activities	(3,821)	(3,473)
Net increase in cash	21,397	5,200
Cash at beginning of period	35,235	6,962
Cash at end of period	56,632	12,162
Supplemental disclosure of cash flow information
Cash paid during the period for interest	984	4,396
Cash paid during the period for income taxes	457	362
Disposal of property and equipment acquired through capital leases		333
Purchase of property and equipment in accounts payable	$ 2,002	$ 2,903