CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 7,622	$ 4,455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,027	5,393
Stock-based compensation expense	4,252	4,447
Deferred income taxes	987	587
Excess tax benefits from stock-based awards	(979)	(1,263)
Allowance for doubtful accounts	1,527	755
Other non-cash charges	420	384
Changes in operating assets and liabilities:
Increase in accounts receivable	(5,826)	(4,695)
Decrease in prepaid expenses and other assets, net	1,740	1,871
Decrease in accounts payable and accrued expenses	(766)	(1,284)
(Decrease) increase in deferred revenue	(917)	1,440
Decrease in deferred rent	(493)	(576)
(Decrease) increase in other liabilities, net	(35)	39
Net cash provided by operating activities	11,559	11,553
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(391)	(652)
Additions to capitalized software	(2,386)	(3,321)
Maturity of U.S. Treasury Bills	2,600	2,599
Purchases of U.S. Treasury Bills	(2,595)	(2,599)
Proceeds from the sale of property and equipment	185	0
Payments to acquire investments	(2,500)	(4,000)
Other investing activities	(53)	(46)
Acquisitions, net of cash acquired	0	(5,724)
Net cash used in investing activities	(5,140)	(13,743)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(8,807)	(615)
Proceeds pursuant to employee stock-based compensation plans	497	898
Excess tax benefits from stock-based awards	979	1,263
Surrender of restricted common stock for income tax purposes	(2,725)	(4,370)
Net cash used in financing activities	(10,056)	(2,824)
Decrease in cash and cash equivalents	(3,637)	(5,014)
Cash and cash equivalents at beginning of period	89,955	90,697
Cash and cash equivalents at end of period	$ 86,318	$ 85,683