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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 25,574 $ 23,010 $ 20,507
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and asset write-offs 8,921 5,359 3,671
Amortization of intangible assets 2,445 2,562 3,620
Net (gains) losses from investments 449 (1,018) (2,301)
Deferred income taxes (10,385) 15,137 2,356
Stock-based compensation 5,397 3,642 4,874
Amortization of premium on investments 2,803 3,321 2,587
Foreign currency losses 405 1,290 1,374
Other non-cash items     55
Changes in assets and liabilities, net of acquisitions      
Accounts receivable 6,959 (7,594) (7,467)
Deferred commissions 2,607 589 (2,968)
Prepaid expenses and other current assets 6,279 (7,805) (8,220)
Accounts payable (490) (1,898) 1,422
Accrued expenses and other liabilities 376 2,485 3,975
Deferred revenue 1,807 16,364 15,172
Net cash provided by operating activities 53,147 55,444 38,657
Cash flows from investing activities:      
Acquisitions   (7,531) (1,660)
Purchases of property and equipment (5,103) (39,776) (13,426)
Purchases of marketable investments (91,421) (113,909) (116,280)
Proceeds from sales and maturities of marketable investments 91,335 93,090 145,195
Change in restricted cash 946 14,542 1,282
Other investing activity 167 548 491
Net cash provided by (used in) investing activities (4,076) (53,036) 15,602
Cash flows from financing activities:      
Dividends paid on common stock (12,588)   (68,414)
Repurchases of common stock (29,843) (18,405) (21,345)
Proceeds from issuance of common stock under employee equity incentive plans 11,215 11,554 25,971
Excess tax benefits from stock-based compensation 345 525 1,949
Payment of deferred acquisition consideration (864)    
Net cash used in financing activities (31,735) (6,326) (61,839)
Effect of exchange rate changes on cash and cash equivalents 427 (1,962) (3,298)
Net increase (decrease) in cash and cash equivalents 17,763 (5,880) (10,878)
Cash and cash equivalents, beginning of year 81,047 86,927 97,805
Cash and cash equivalents, end of year 98,810 81,047 86,927
Supplemental disclosure of cash flow information:      
Cash paid for income taxes $ 7,102 $ 5,929 $ 16,583