CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 67,062	$ 68,921	$ 5,135
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation	24,092	23,805	24,871
Amortization	98,477	73,545	77,353
Amortization of operating lease right-of-use assets	15,934	0	0
Amortization of deferred debt issuance costs	4,128	4,637	4,286
Deferred income taxes	(22,140)	(5,734)	21,660
Stock-based compensation expense	36,763	20,360	13,683
Other	5,175	2,007	435
Changes in operating assets and liabilities, net of impact of acquisitions:
Receivables	(19,054)	(14,760)	(8,243)
Accounts payable	(7,703)	5,766	(1,700)
Accrued employee compensation	(10,829)	(9,684)	94
Current income taxes	(1,137)	(5,115)	(4,227)
Deferred revenue	(37,561)	14,219	439
Other current and noncurrent assets and liabilities	(15,558)	5,965	12,411
Net cash flows from operating activities	137,649	183,932	146,197
Cash flows from investing activities:
Purchases of property and equipment	(23,099)	(18,265)	(25,717)
Purchases of software and distribution rights	(24,915)	(25,628)	(28,697)
Acquisition of businesses, net of cash acquired	(757,268)	0	0
Other	(25,199)	(1,467)	0
Net cash flows from investing activities	(830,481)	(45,360)	(54,414)
Cash flows from financing activities:
Proceeds from issuance of common stock	3,591	3,098	2,958
Proceeds from exercises of stock options	12,985	19,674	13,872
Repurchase of stock-based compensation awards for tax withholdings	(3,986)	(2,588)	(5,311)
Repurchase of common stock	(35,617)	(54,527)	(37,387)
Proceeds from senior notes	0	400,000	0
Redemption of senior notes	0	(300,000)	0
Proceeds from revolving credit facility	280,000	109,000	67,000
Repayments of revolving credit facility	(41,000)	(111,000)	(153,000)
Proceeds from term portion of credit agreement	500,000	0	415,000
Repayments of term portion of credit agreement	(28,900)	(109,289)	(386,040)
Payment for debt issuance costs	(12,830)	(7,319)	(5,340)
Payments on or proceeds from other debt, net	(7,020)	(4,753)	(9,900)
Net cash flows from financing activities	667,223	(57,704)	(98,148)
Effect of exchange rate fluctuations on cash	(1,495)	(2,076)	322
Net increase (decrease) in cash and cash equivalents	(27,104)	78,792	(6,043)
Cash and cash equivalents, beginning of period	148,502	69,710	75,753
Cash and cash equivalents, end of period	121,398	148,502	69,710
Supplemental cash flow information
Income taxes paid, net	27,727	32,205	37,817
Interest paid	$ 58,980	$ 35,300	$ 34,976