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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 3,181 $ 2,911
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 1,993 970
Amortization of intangible assets 614 693
Net gains from investments (59) (582)
Deferred income taxes (549) 495
Stock-based compensation 1,323 1,438
Amortization of premium on investments 759 812
Foreign currency (gains) losses (8) 562
Changes in assets and liabilities, net of acquisitions    
Accounts receivable 29,518 25,956
Deferred commissions 1,743 804
Prepaid expenses and other current assets (5,317) (2,627)
Accounts payable (544) 988
Accrued expenses and other liabilities (669) (4,754)
Deferred revenue 2,901 4,495
Net cash provided by operating activities 34,886 32,161
Cash flows from investing activities:    
Purchases of property and equipment (2,418) (10,711)
Purchases of marketable investments (40,301) (32,038)
Proceeds from sales and maturities of marketable investments 34,090 18,039
Change in restricted cash 946 7,182
Other investing activity 33 82
Net cash used in investing activities (7,650) (17,446)
Cash flows from financing activities:    
Dividend paid on common stock (3,195)  
Repurchases of common stock (7,700) (8,567)
Proceeds from issuance of common stock under employee equity incentive plans 1,997 2,055
Excess tax benefits from stock-based compensation 183 31
Payment of deferred acquisition consideration (139)  
Net cash used in financing activities (8,854) (6,481)
Effect of exchange rate changes on cash and cash equivalents 978 2,439
Net increase in cash and cash equivalents 19,360 10,673
Cash and cash equivalents, beginning of period 81,047 86,927
Cash and cash equivalents, end of period $ 100,407 $ 97,600