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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income (loss) $ 13,477 $ (818)
Adjustments to reconcile net income (loss) to net cash flows from operating activities    
Depreciation 13,533 9,688
Amortization 36,250 27,145
Provision for doubtful accounts receivable 390 (1,266)
Deferred income taxes (5,340) (7,767)
Stock-based compensation expense 11,110 11,661
Excess tax benefit of stock options exercised (2,564) (3,378)
Other 4,284 317
Changes in operating assets and liabilities, net of impact of acquisitions:    
Billed and accrued receivables, net 25,782 (11,265)
Other current and noncurrent assets 89 3,480
Accounts payable (15,029) 16
Accrued employee compensation (5,007) (26,289)
Accrued liabilities (2,917) (9,967)
Current income taxes 6,195 (11,546)
Deferred revenue 5,881 9,654
Other current and noncurrent liabilities 426 (2,407)
Net cash flows from operating activities 86,560 (12,742)
Cash flows from investing activities:    
Purchases of property and equipment (11,482) (10,032)
Purchases of software and distribution rights (6,878) (3,558)
Acquisition of businesses, net of cash acquired (264,202) (325,232)
Other investments   (1,046)
Net cash flows from investing activities (282,562) (339,868)
Cash flows from financing activities:    
Proceeds from issuance of common stock 1,532 1,028
Proceeds from exercises of stock options 9,892 15,059
Excess tax benefit of stock options exercised 2,564 3,378
Repurchases of common stock (80,648) (57,836)
Repurchase of restricted stock and performance shares for tax withholdings (5,894) (2,942)
Exercise of common stock warrants   11,866
Cash settlement of common stock warrants   (29,596)
Proceeds from revolver portion of credit agreement   119,000
Proceeds from term portion of credit agreement 300,000 200,000
Proceeds from issuance of senior notes 300,000  
Repayment of term portion of credit agreement (21,996) (9,375)
Repayment of revolver portion of credit agreement (188,000)  
Payments for debt issuance costs (16,397) (1,094)
Payment of acquired debt (7,500)  
Payments on debt and capital leases (5,822) (5,783)
Net cash flows from financing activities 287,731 243,705
Effect of exchange rate fluctuations on cash (1,547) (511)
Net increase (decrease) in cash and cash equivalents 90,182 (109,416)
Cash and cash equivalents, beginning of period 76,329 197,098
Cash and cash equivalents, end of period 166,511 87,682
Supplemental cash flow information    
Income taxes paid, net 11,499 21,434
Interest paid $ 11,291 $ 5,957