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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 45,232 $ 46,398
Adjustments to reconcile net income to net cash provided by operating activities-    
Depreciation 13,293 9,975
Amortization 31,974 21,670
Amortization of original issue discount 1,984 2,147
Asset impairment 1,428 2,135
Gain on short-term investments and other (65) (76)
Loss on extinguishment of debt 810  
Deferred income taxes 2,150 1,487
Stock-based compensation 14,805 16,659
Changes in operating assets and liabilities, net of acquired amounts:    
Trade accounts receivable, net (15,952) 7,567
Other current and non-current assets (21,763) (1,788)
Income taxes payable/receivable 5,365 1,715
Trade accounts payable and accrued liabilities (13,174) (16,007)
Deferred revenue 7,182 10,940
Net cash provided by operating activities 73,269 102,822
Cash flows from investing activities:    
Purchases of software, property and equipment (44,047) (23,370)
Purchases of short-term investments (53,285) (116,203)
Proceeds from sale/maturity of short-term investments 190,467 150,768
Acquisition of and investments in business, net of cash acquired (71,443)  
Acquisition of and investments in client contracts   (10,082)
Net cash provided by investing activities 21,692 1,113
Cash flows from financing activities:    
Proceeds from issuance of common stock 1,701 1,259
Payment of cash dividends (21,197) (20,405)
Repurchase of common stock (24,034) (24,764)
Proceeds from long-term debt 150,000  
Payments on long-term debt (123,750) (11,250)
Settlement of convertible notes   (34,771)
Payments of deferred financing costs (1,490)  
Net cash used in financing activities (18,770) (89,931)
Effect of exchange rate fluctuations on cash (1,262) 2,396
Net increase in cash and cash equivalents 74,929 16,400
Cash and cash equivalents, beginning of period 122,243 126,351
Cash and cash equivalents, end of period 197,172 142,751
Cash paid during the period for-    
Interest 14,181 13,638
Income taxes $ 8,426 $ 16,407