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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 29,131 $ 31,818
Adjustments to reconcile net income to net cash provided by operating activities-    
Depreciation 8,462 6,631
Amortization 20,957 14,418
Amortization of original issue discount 1,313 1,513
Asset impairment 1,001 2,147
Gain on short-term investments and other (108) (37)
Loss on extinguishment of debt 810  
Deferred income taxes 4,944 1,725
Stock-based compensation 10,213 11,644
Changes in operating assets and liabilities, net of acquired amounts:    
Trade accounts receivable, net (11,369) 7,796
Other current and non-current assets (13,995) (4,787)
Income taxes payable/receivable 1,828 (1,402)
Trade accounts payable and accrued liabilities (27,772) (19,266)
Deferred revenue 799 12,288
Net cash provided by operating activities 26,214 64,488
Cash flows from investing activities:    
Purchases of property and equipment (26,715) (18,738)
Purchases of short-term investments (44,345) (73,831)
Proceeds from sale/maturity of short-term investments 116,866 104,291
Acquisition of and investments in business, net of cash acquired (68,636)  
Acquisition of and investments in client contracts   (7,526)
Net cash provided by (used in) investing activities (22,830) 4,196
Cash flows from financing activities:    
Proceeds from issuance of common stock 1,134 846
Payment of cash dividends (14,375) (13,713)
Repurchase of common stock (18,319) (16,482)
Proceeds from long-term debt 150,000  
Payments on long-term debt (121,875) (7,500)
Settlement of convertible notes   (34,771)
Payments of deferred financing costs (1,490)  
Net cash used in financing activities (4,925) (71,620)
Effect of exchange rate fluctuations on cash (1,031) 1,696
Net decrease in cash and cash equivalents (2,572) (1,240)
Cash and cash equivalents, beginning of period 122,243 126,351
Cash and cash equivalents, end of period 119,671 125,111
Cash paid during the period for-    
Interest 7,744 7,629
Income taxes $ 4,778 $ 10,490