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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 50,235 $ 38,899
Adjustments to reconcile net income to net cash provided by operating activities-    
Depreciation 10,423 11,268
Amortization 19,921 22,353
Amortization of original issue discount 3,856 4,639
(Gain) loss on short-term investments and other (23) 179
Loss on repurchase of convertible notes 8,651  
(Gain) loss on disposition of business operations (6,611) 767
Deferred income taxes (2,159) (5,556)
Excess tax benefit of stock-based compensation awards (4,622) (2,174)
Stock-based compensation 17,273 15,775
Changes in operating assets and liabilities, net of acquired amounts:    
Trade accounts receivable, net (16,275) (1,869)
Other current and non-current assets 199 (6,092)
Income taxes payable/receivable (2,750) 3,588
Trade accounts payable and accrued liabilities (23,628) (3,703)
Deferred revenue 5,016 6,272
Net cash provided by operating activities 59,506 84,346
Cash flows from investing activities:    
Purchases of property and equipment (11,542) (16,776)
Purchases of short-term investments (122,736) (107,462)
Proceeds from sale/maturity of short-term investments 107,816 127,766
Acquisition of and investments in business, net of cash acquired   (962)
Acquisition of and investments in client contracts (6,038) (6,374)
Proceeds from the disposition of business operations 8,850  
Net cash used in investing activities (23,650) (3,808)
Cash flows from financing activities:    
Proceeds from issuance of common stock 1,120 1,148
Payment of cash dividends (18,325) (16,811)
Repurchase of common stock (22,455) (64,995)
Payments on acquired asset financing   (829)
Proceeds from long-term debt 230,000 150,000
Payments on long-term debt (5,625) (125,625)
Repurchase of convertible notes (215,657)  
Payments of deferred financing costs (6,744) (2,742)
Excess tax benefit of stock-based compensation awards 4,622 2,174
Net cash used in financing activities (33,064) (57,680)
Effect of exchange rate fluctuations on cash 4,798 (4,405)
Net increase in cash and cash equivalents 7,590 18,453
Cash and cash equivalents, beginning of period 132,631 81,712
Cash and cash equivalents, end of period 140,221 100,165
Cash paid during the period for-    
Interest 11,165 7,484
Income taxes $ 35,260 $ 30,998