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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
Operating activities:    
Net income $ 16,935 $ 5,201
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 9,174 7,203
Amortization 21,063 14,996
Amortization of debt issuance costs 2,273 1,235
Excess tax expense (benefit) from stock-based compensation (15,405) 57
Stock-based compensation expense 32,270 8,667
Deferred income tax expense (benefit), net (6,448) 11,828
Provision for losses on accounts receivable 1,819 1,418
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (8,305) (3,612)
Prepaid expenses and other current assets (533) (1,848)
Deposits and other assets 220 1,286
Accounts payable and other liabilities 17,413 4,222
Deferred revenue 2,352 5,905
Net cash provided by operating activities 72,828 56,558
Investing activities:    
Proceeds from sale and settlement of investments 87 14,620
Purchases of property and equipment and other assets (15,331) (9,002)
Acquisitions, net of cash acquired 0 (640,929)
Net cash used in investing activities (15,244) (635,311)
Financing activities:    
Proceeds from long-term debt 0 175,000
Payments of long-term debt (13,125) (4,375)
Payments of debt issuance costs 0 (11,546)
Payments of deferred consideration (1,344) 0
Excess tax benefit (expense) from stock-based compensation 15,405 (57)
Repurchase of restricted stock to satisfy tax withholding obligations (7,563) (3,817)
Proceeds from exercise of stock options and ESPP 15,846 7,667
Net cash provided by financing activities 9,219 162,872
Effect of foreign currency exchange rates on cash and cash equivalents 108 63
Net increase (decrease) in cash and cash equivalents 66,911 (415,818)
Cash and cash equivalents at the beginning of period 156,027 545,280
Cash and cash equivalents at the end of period $ 222,938 $ 129,462