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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 17,651 $ 11,996 $ 10,865
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and asset write offs 7,812 8,350 9,325
Amortization of intangible assets 831 891 2,171
Net losses from investments 805 18 288
Deferred income taxes 2,602 (985) (7,526)
Stock-based compensation 7,976 8,347 7,444
Amortization of premium on investments 345 693 1,273
Foreign currency (gains) losses (81) 38 141
Changes in assets and liabilities      
Accounts receivable 7,963 (718) 9,140
Deferred commissions 1,477 225 (815)
Prepaid expenses and other current assets 311 1,431 620
Accounts payable 1,317 (357) (82)
Accrued expenses and other liabilities (2,011) 4,657 2,171
Deferred revenue (5,140) (2,120) (6,220)
Net cash provided by operating activities 41,858 32,466 28,795
Cash flows from investing activities:      
Purchases of property and equipment (4,140) (3,931) (1,503)
Purchases of marketable investments (36,763) (20,587) (35,386)
Proceeds from sales and maturities of marketable investments 23,086 26,960 60,112
Other investing activity (48) 347 1,542
Net cash provided by (used in) investing activities (17,865) 2,789 24,765
Cash flows from financing activities:      
Dividends paid on common stock (12,987) (12,179) (11,962)
Repurchases of common stock (1,791) (20,931) (73,166)
Proceeds from issuance of common stock under employee equity incentive plans 16,734 3,347 8,969
Excess tax benefits from stock-based compensation 550 51 244
Net cash provided by (used in) financing activities 2,506 (29,712) (75,915)
Effect of exchange rate changes on cash and cash equivalents (2,872) (1,862) (2,127)
Net increase (decrease) in cash and cash equivalents 23,627 3,681 (24,482)
Cash and cash equivalents, beginning of year 53,331 49,650 74,132
Cash and cash equivalents, end of year 76,958 53,331 49,650
Supplemental disclosure of cash flow information:      
Cash paid for income taxes $ 8,507 $ 6,425 $ 14,180