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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 9,691 $ 14,898
Adjustments to reconcile net income to net cash provided by operating activities-    
Depreciation 3,486 5,000
Amortization 8,590 9,736
Amortization of original issue discount 1,404 1,299
Loss on short-term investments and other 453 867
Gain on disposition of business operations (222)  
Deferred income taxes 2,772 6,447
Excess tax benefit of stock-based compensation awards (1,974) (537)
Stock-based employee compensation 3,783 3,610
Changes in operating assets and liabilities, net of acquired amounts:    
Trade accounts receivable, net (18,029) 12,763
Other current and non-current assets (3,448) (3,342)
Income taxes payable/receivable 707 (8,641)
Trade accounts payable and accrued liabilities (17,464) (29,450)
Deferred revenue 1,673 9,894
Net cash provided by (used in) operating activities (8,578) 22,544
Cash flows from investing activities:    
Purchases of property and equipment (4,499) (4,492)
Purchases of short-term investments (40,531) (23,220)
Proceeds from sale/maturity of short-term investments 50,855 29,500
Acquisition of and investments in client contracts (1,509) (407)
Proceeds from the disposition of business operations 630  
Net cash provided by investing activities 4,946 1,381
Cash flows from financing activities:    
Proceeds from issuance of common stock 340 610
Payment of cash dividends (5,162)  
Repurchase of common stock (6,518) (11,343)
Payments on long-term debt (3,750) (3,750)
Excess tax benefit of stock-based compensation awards 1,974 537
Net cash used in financing activities (13,116) (13,946)
Effect of exchange rate fluctuations on cash (484) (108)
Net increase (decrease) in cash and cash equivalents (17,232) 9,871
Cash and cash equivalents, beginning of period 82,686 133,747
Cash and cash equivalents, end of period 65,454 143,618
Cash paid during the period for-    
Interest 3,322 3,378
Income taxes $ 3,755 $ 611