Condensed 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 [Member]	Total
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		134				134
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan, shares	32,000
Net tax benefit from stock option exercises and restricted stock vesting		678				678
Stock compensation related to restricted stock vesting and retirement savings plan contributions		6,995				6,995
Stock compensation related to restricted stock vesting and retirement savings plan contributions, shares	490,000
Purchases of treasury stock and buyback of shares for taxes				(1,187)		(1,187)
Purchases of treasury stock and buyback of shares for taxes, shares	(105,000)
Issuance of stock for acquisitions	2	15,570				15,572
Issuance of stock for acquisitions, shares	1,686,000
Net income					11,731	11,731
Foreign currency translation adjustment			9			9
Balance at Sep. 30, 2012	$ 38	$ 272,232	$ (270)	$ (56,182)	$ 17,073	$ 232,891
Balance, shares at Sep. 30, 2012	30,846,000					30,846,332