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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income (loss) $ 1,289 $ (224)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 1,965 2,107
Amortization of intangible assets 209 221
Net losses from investments   19
Deferred income taxes (177) 109
Stock-based compensation 2,135 2,186
Amortization of premium on investments 107 187
Foreign currency (gains) losses 464 (166)
Changes in assets and liabilities    
Accounts receivable 18,138 16,802
Deferred commissions 213 785
Prepaid expenses and other current assets (3,001) (5,449)
Accounts payable 763 (13)
Accrued expenses and other liabilities (14,150) (7,984)
Deferred revenue 13,582 7,702
Net cash provided by operating activities 21,537 16,282
Cash flows from investing activities:    
Purchases of property and equipment (1,144) (948)
Purchases of marketable investments (2,206) (14,552)
Proceeds from sales and maturities of marketable investments 8,710 8,578
Other investing activity (20) 204
Net cash provided by (used in) investing activities 5,340 (6,718)
Cash flows from financing activities:    
Dividends paid on common stock (3,201) (3,069)
Repurchases of common stock   (5,723)
Proceeds from issuance of common stock under employee equity incentive plans 1,182 1,349
Excess tax benefits from stock-based compensation 14 20
Net cash used in financing activities (2,005) (7,423)
Effect of exchange rate changes on cash and cash equivalents 451 (1,623)
Net increase in cash and cash equivalents 25,323 518
Cash and cash equivalents, beginning of period 53,331 49,650
Cash and cash equivalents, end of period $ 78,654 $ 50,168