CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 18,736	$ 342
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	13,945	15,121
Depreciation	31,310	30,766
Amortization of intangibles	27,031	27,800
Amortization of debt issuance costs and debt discount	2,445	2,338
Deferred income taxes	(4,458)	(2,139)
Change in fair value of acquisition-related contingent consideration	0	3
Other	1,252	1,008
Changes in assets and liabilities:
Accounts receivable	(13,324)	(2,293)
Prepaid expenses and other current assets	(6,835)	(110)
Income taxes receivable	(2,505)	(2,517)
Other assets	1,206	(1,458)
Accounts payable and accrued expenses	0	3,649
Accrued compensation	(9,323)	(6,533)
Other current and non-current liabilities	2,062	(3,158)
Deferred revenue	(4,018)	472
Payment for acquisition-related contingent consideration	0	(160)
Net cash provided by operating activities	57,524	63,131
Cash flows from investing activities:
Purchases of property and equipment	(8,279)	(12,787)
Investment in capitalized software	(32,216)	(22,677)
Purchase of intangible assets	(9,254)	(10,819)
Net cash used in investing activities	(49,749)	(46,283)
Cash flows from financing activities:
Proceeds from credit facility borrowings	0	99,000
Repayment of credit facility borrowings	(4,900)	(103,900)
Payments for debt issuance costs	0	(1,000)
Proceeds from exercise of stock options	1,110	183
Finance lease liabilities paid	(2,414)	(1,331)
Tax payments for equity award issuances	(7,536)	(5,110)
Payment for acquisition-related contingent consideration	0	(2,173)
Net cash used in financing activities	(13,740)	(14,331)
(Decrease) Increase in cash and cash equivalents	(5,965)	2,517
Cash and cash equivalents, beginning of period	123,880	93,094
Cash and cash equivalents, end of period	117,915	95,611
Supplemental cash flow disclosure:
Income taxes paid, net	9,966	352
Interest paid	22,271	26,994
Non-cash transactions:
Accruals for purchases of property and equipment	5,876	3,559
Accruals for investment in capitalized software	6,839	773
Accruals for purchase of intangible assets	1,390	0
Leasehold improvements paid by lessor	$ 0	$ 305