Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 5,526	$ 4,223
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,203	5,062
Amortization of intangible assets	445	1,075
Net (gains) losses from investments	9	(80)
Deferred income taxes	(1,514)	(2,964)
Stock-based compensation	3,661	3,165
Amortization of premium on investments	381	751
Foreign currency losses	70	319
Changes in assets and liabilities
Accounts receivable	24,353	36,210
Deferred commissions	2,769	1,661
Prepaid expenses and other current assets	(511)	(797)
Accounts payable	(195)	(75)
Accrued expenses and other liabilities	(7,268)	(4,159)
Deferred revenue	(7,168)	(9,110)
Net cash provided by operating activities	24,761	35,281
Cash flows from investing activities:
Purchases of property and equipment	(1,678)	(871)
Purchases of marketable investments	(18,575)	(27,165)
Proceeds from sales and maturities of marketable investments	12,478	26,464
Other investing activity	266	1,437
Net cash used in investing activities	(7,509)	(135)
Cash flows from financing activities:
Dividends paid on common stock	(6,126)	(6,128)
Repurchases of common stock	(11,786)	(54,940)
Proceeds from issuance of common stock under employee equity incentive plans	1,906	4,186
Excess tax benefits from stock-based compensation	31	100
Net cash used in financing activities	(15,975)	(56,782)
Effect of exchange rate changes on cash and cash equivalents	(764)	138
Net increase (decrease) in cash and cash equivalents	513	(21,498)
Cash and cash equivalents, beginning of period	49,650	74,132
Cash and cash equivalents, end of period	$ 50,163	$ 52,634