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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 14,014 $ 20,237
Adjustments to reconcile net income to net cash provided by operating activities-    
Depreciation 3,914 3,315
Amortization 9,946 7,471
Amortization of original issue discount 652 888
Asset impairment 339  
Gain on short-term investments and other (17) (57)
Loss on extinguishment of debt 810  
Deferred income taxes 4,017 5,971
Stock-based compensation 4,572 5,670
Changes in operating assets and liabilities, net of acquired amounts:    
Trade accounts receivable, net 25,459 5,650
Other current and non-current assets (4,629) 2,793
Income taxes payable/receivable 1,035 (5,692)
Trade accounts payable and accrued liabilities (26,926) (21,943)
Deferred revenue (3,331) 5,661
Net cash provided by operating activities 29,855 29,964
Cash flows from investing activities:    
Purchases of property and equipment (12,235) (9,557)
Purchases of short-term investments (15,070) (17,983)
Proceeds from sale/maturity of short-term investments 79,508 37,782
Acquisition of and investments in business, net of cash acquired (68,636)  
Acquisition of and investments in client contracts   (4,363)
Net cash provided by (used in) investing activities (16,433) 5,879
Cash flows from financing activities:    
Proceeds from issuance of common stock 484 385
Payment of cash dividends (7,437) (7,033)
Repurchase of common stock (11,920) (11,224)
Proceeds from long-term debt 150,000  
Payments on long-term debt (120,000) (3,750)
Settlement of convertible notes   (34,771)
Payments of deferred financing costs (1,442)  
Net cash provided by (used in) financing activities 9,685 (56,393)
Effect of exchange rate fluctuations on cash 2,153 1,621
Net increase (decrease) in cash and cash equivalents 25,260 (18,929)
Cash and cash equivalents, beginning of period 122,243 126,351
Cash and cash equivalents, end of period 147,503 107,422
Cash paid during the period for-    
Interest 5,844 6,539
Income taxes $ 1,162 $ 1,835