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, 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 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
Purchase of treasury stock				(14,676)		(14,676)
Purchase 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 income					6,480	6,480
Foreign currency translation adjustment			23			23
Net unrealized gain (loss) on investments			25			25
Balance at Dec. 31, 2010	33	224,966	(225)	(42,205)	(5,405)	177,164
Balance, shares at Dec. 31, 2010	27,276,000
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 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 and buyback of shares for taxes				(12,790)		(12,790)
Purchases of treasury stock and buyback of shares for taxes, shares	(1,378,000)
Issuance of stock for acquisitions	1	9,782				9,783
Issuance of stock for acquisitions, shares	1,102,000
Net income					10,747	10,747
Foreign currency translation adjustment			(35)			(35)
Net unrealized gain (loss) on investments			(19)			(19)
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
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan		202				202
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan, shares	56,000
Net tax benefit from stock option exercises and restricted stock vesting		855				855
Stock compensation related to restricted stock vesting and retirement savings plan contributions	1	9,589				9,590
Stock compensation related to restricted stock vesting and retirement savings plan contributions, shares	950,000
Purchases of treasury stock and buyback of shares for taxes				(7,975)		(7,975)
Purchases of treasury stock and buyback of shares for taxes, shares	(724,000)
Issuance of stock for acquisitions	2	16,700				16,702
Issuance of stock for acquisitions, shares	1,800,000
Net income					16,107	16,107
Foreign currency translation adjustment			(27)			(27)
Balance at Dec. 31, 2012	$ 39	$ 276,201	$ (306)	$ (62,970)	$ 21,449	$ 234,413
Balance, shares at Dec. 31, 2012	30,825,000					30,825,123