Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 9,976	$ 7,266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and asset write-offs	6,408	7,236
Amortization of intangible assets	669	1,605
Net (gains) losses from investments	(236)	25
Deferred income taxes	(2,463)	(5,406)
Stock-based compensation	5,885	5,148
Amortization of premium on investments	556	1,048
Foreign currency losses	64	234
Changes in assets and liabilities
Accounts receivable	29,511	37,921
Deferred commissions	4,422	3,230
Prepaid expenses and other current assets	(148)	(255)
Accounts payable	(284)	18
Accrued expenses and other liabilities	(7,115)	(7,924)
Deferred revenue	(19,027)	(22,295)
Net cash provided by operating activities	28,218	27,851
Cash flows from investing activities:
Purchases of property and equipment	(2,316)	(1,110)
Purchases of marketable investments	(20,587)	(27,165)
Proceeds from sales and maturities of marketable investments	16,428	51,610
Other investing activity	275	1,471
Net cash provided by (used in) investing activities	(6,200)	24,806
Cash flows from financing activities:
Dividends paid on common stock	(9,163)	(9,053)
Repurchases of common stock	(18,639)	(66,557)
Proceeds from issuance of common stock under employee equity incentive plans	2,899	6,781
Excess tax benefits from stock-based compensation	32	157
Net cash used in financing activities	(24,871)	(68,672)
Effect of exchange rate changes on cash and cash equivalents	(1,211)	(1,185)
Net decrease in cash and cash equivalents	(4,064)	(17,200)
Cash and cash equivalents, beginning of period	49,650	74,132
Cash and cash equivalents, end of period	$ 45,586	$ 56,932