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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 13,047 $ 11,861
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,775 5,982
Amortization of intangible assets 582 627
Net losses from investments 997 1,139
Deferred income taxes (921) (413)
Stock-based compensation 6,423 5,731
Amortization of premium on investments 171 267
Foreign currency losses 444 98
Changes in assets and liabilities    
Accounts receivable 20,140 31,078
Deferred commissions 2,906 3,890
Prepaid expenses and other current assets (979) 2,322
Accounts payable (1,208) 133
Accrued expenses and other liabilities (6,041) (10,101)
Deferred revenue (3,473) (14,309)
Net cash provided by operating activities 36,863 38,305
Cash flows from investing activities:    
Purchases of property and equipment (5,806) (3,334)
Purchases of marketable investments (27,430) (35,555)
Proceeds from sales and maturities of marketable investments 34,458 20,086
Other investing activity 200 (49)
Net cash provided by (used in) investing activities 1,422 (18,852)
Cash flows from financing activities:    
Dividends paid on common stock (10,205) (9,696)
Repurchases of common stock (39,967)  
Proceeds from issuance of common stock under employee equity incentive plans 13,866 9,987
Taxes paid related to net share settlements of stock-based compensation awards (2,511) (2,069)
Net cash used in financing activities (38,817) (1,778)
Effect of exchange rate changes on cash and cash equivalents 3,534 (870)
Net increase in cash and cash equivalents 3,002 16,805
Cash and cash equivalents, beginning of period 76,958 53,331
Cash and cash equivalents, end of period $ 79,960 $ 70,136