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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 68,921 $ 5,135 $ 129,535
Adjustments to reconcile net income to net cash flows from operating activities:      
Depreciation 23,805 24,871 22,584
Amortization 73,545 77,353 80,870
Amortization of deferred debt issuance costs 4,637 4,286 5,567
Deferred income taxes (5,734) 21,660 17,702
Stock-based compensation expense 20,360 13,683 43,613
Gain on sale of CFS assets     (151,463)
Other 2,007 435 806
Changes in operating assets and liabilities, net of impact of acquisitions:      
Receivables (14,760) (8,243) (76,460)
Accounts payable 5,766 (1,700) (13,920)
Accrued employee compensation (9,684) 94 18,060
Current income taxes (5,115) (4,227) 14,510
Deferred revenue 14,219 439 3,015
Other current and noncurrent assets and liabilities 5,965 12,411 5,411
Net cash flows from operating activities 183,932 146,197 99,830
Cash flows from investing activities:      
Purchases of property and equipment (18,265) (25,717) (40,812)
Purchases of software and distribution rights (25,628) (28,697) (22,268)
Proceeds from sale of CFS assets     199,481
Acquisition of businesses, net of cash acquired     232
Other (1,467)   (7,000)
Net cash flows from investing activities (45,360) (54,414) 129,633
Cash flows from financing activities:      
Proceeds from issuance of common stock 3,098 2,958 2,987
Proceeds from exercises of stock options 19,674 13,872 9,325
Repurchase of restricted stock for tax withholdings (2,588) (5,311) (2,975)
Repurchases of common stock (54,527) (37,387) (60,089)
Proceeds from senior notes 400,000    
Redemption of senior notes (300,000)    
Proceeds from revolving credit facility 109,000 67,000 76,000
Repayments of revolving credit facility (111,000) (153,000) (166,000)
Proceeds from term portion of credit agreement   415,000  
Repayments of term portion of credit agreement (109,289) (386,040) (95,293)
Payment for debt issuance costs (7,319) (5,340) (655)
Payments on other debt and capital leases (4,753) (9,900) (14,376)
Net cash flows from financing activities (57,704) (98,148) (251,076)
Effect of exchange rate fluctuations on cash (2,076) 322 (4,873)
Net increase (decrease) in cash and cash equivalents 78,792 (6,043) (26,486)
Cash and cash equivalents, beginning of period 69,710 75,753 102,239
Cash and cash equivalents, end of period 148,502 69,710 75,753
Supplemental cash flow information      
Income taxes paid, net 32,205 37,817 19,081
Interest paid $ 35,300 $ 34,976 $ 35,053