Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2014	$ 43	$ 334,645	$ (651)	$ (95,353)	$ 66,044	$ 304,728
Balance (in shares) at Dec. 31, 2014	32,855,000					32,854,802
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan		229				$ 229
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan (in shares)	19,000
Net tax benefit from stock option exercises and restricted stock vesting		852				852
Stock compensation related to restricted stock vesting and retirement savings plan contributions		6,622				6,622
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	451,000
Purchases of treasury stock and buyback of shares for taxes				(6,271)		(6,271)
Purchases of treasury stock and buyback of shares for taxes (in shares)	(316,000)
Issuance of stock for acquisitions	$ 1	11,411				11,412
Issuance of stock for acquisitions (in shares)	758,000
Net income					8,063	8,063
Foreign currency translation adjustment			(152)			(152)
Balance at Jun. 30, 2015	$ 44	$ 353,759	$ (803)	$ (101,624)	$ 74,107	$ 325,483
Balance (in shares) at Jun. 30, 2015	33,767,000					33,766,673