Consolidated Statement Of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Retained Earnings (Deficit) [Member]	Total
Balance at Dec. 31, 2008	$ 30	$ 197,653	$ (338)	$ (9,179)	$ (13,348)	$ 174,818
Balance, shares at Dec. 31, 2008	28,502,000
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	1	974				975
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan, shares	298,000
Net tax benefit (shortfall) from stock option exercises and restricted stock vesting		(459)				(459)
Stock compensation related to restricted stock vesting and retirement savings plan contributions	1	9,835				9,836
Stock compensation related to restricted stock vesting and retirement savings plan contributions, shares	973,000
Purchases of treasury stock				(18,350)		(18,350)
Purchases of treasury stock, shares	(2,690,000)
Net unrealized loss on investments			(5)			(5)
Foreign currency translation adjustment			70			70
Net income					1,463	1,463
Total comprehensive income						1,528
Balance at Dec. 31, 2009	32	208,003	(273)	(27,529)	(11,885)	168,348
Balance, shares at Dec. 31, 2009	27,083,000
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan		1,468				1,468
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan, shares	381,000
Net tax benefit (shortfall) from stock option exercises and restricted stock vesting		1,038				1,038
Stock compensation related to restricted stock vesting and retirement savings plan contributions	1	10,830				10,831
Stock compensation related to restricted stock vesting and retirement savings plan contributions, shares	920,000
Purchases of treasury stock				(14,676)		(14,676)
Purchases of treasury stock, shares	(1,559,000)
Issuance of stock for acquisitions		3,627				3,627
Issuance of stock for acquisitions, shares	451,000
Net unrealized loss on investments			25			25
Foreign currency translation adjustment			23			23
Net income					6,480	6,480
Total comprehensive income						6,528
Balance at Dec. 31, 2010	33	224,966	(225)	(42,205)	(5,405)	177,164
Balance, shares at Dec. 31, 2010	27,276,000					27,275,936
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	1	3,711				3,712
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan, shares	814,000
Net tax benefit (shortfall) from stock option exercises and restricted stock vesting		1,219				1,219
Stock compensation related to restricted stock vesting and retirement savings plan contributions	1	9,177				9,178
Stock compensation related to restricted stock vesting and retirement savings plan contributions, shares	929,000
Purchases of treasury stock				(12,790)		(12,790)
Purchases of treasury stock, shares	(1,378,000)
Issuance of stock for acquisitions	1	9,782				9,783
Issuance of stock for acquisitions, shares	1,102,000
Net unrealized loss on investments			(19)			(19)
Foreign currency translation adjustment			(35)			(35)
Net income					10,747	10,747
Total comprehensive income						10,693
Balance at Dec. 31, 2011	$ 36	$ 248,855	$ (279)	$ (54,995)	$ 5,342	$ 198,959
Balance, shares at Dec. 31, 2011	28,743,000					28,742,906