Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 3,030	$ 1,289
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,679	1,965
Amortization of intangible assets	191	209
Net losses from investments	203
Deferred income taxes	(257)	(177)
Stock-based compensation	2,049	2,135
Amortization of premium on investments	61	107
Foreign currency losses	215	464
Changes in assets and liabilities
Accounts receivable	3,839	18,138
Deferred commissions	(235)	213
Prepaid expenses and other current assets	138	(2,987)
Accounts payable	(1,485)	763
Accrued expenses and other liabilities	(11,512)	(14,125)
Deferred revenue	21,538	13,582
Net cash provided by operating activities	19,454	21,576
Cash flows from investing activities:
Purchases of property and equipment	(1,540)	(1,144)
Purchases of marketable investments	(11,503)	(2,206)
Proceeds from sales and maturities of marketable investments	12,200	8,710
Other investing activity	184	(20)
Net cash provided by (used in) investing activities	(659)	5,340
Cash flows from financing activities:
Dividends paid on common stock	(3,462)	(3,201)
Repurchases of common stock	(21,453)
Proceeds from issuance of common stock under employee equity incentive plans	2,723	1,182
Taxes paid related to net share settlements of stock-based compensation awards	(56)	(25)
Net cash used in financing activities	(22,248)	(2,044)
Effect of exchange rate changes on cash and cash equivalents	671	451
Net increase (decrease) in cash and cash equivalents	(2,782)	25,323
Cash and cash equivalents, beginning of period	76,958	53,331
Cash and cash equivalents, end of period	$ 74,176	$ 78,654