CONSOLIDATED STATEMENTS OF CHANGES IN 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, 2011	$ 36	$ 248,855	$ (279)	$ (54,995)	$ 5,342	$ 198,959
Balance (in shares) at Dec. 31, 2011	28,743,000
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	0	202	0	0	0	202
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan (in shares)	56,000
Net tax benefit from stock option exercises and restricted stock vesting	0	855	0	0	0	855
Stock compensation related to restricted stock vesting and retirement savings plan contributions	1	9,589	0	0	0	9,590
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	950,000
Purchases of treasury stock	0	0	0	(7,975)	0	(7,975)
Purchases of treasury stock (in shares)	(724,000)
Issuance of stock for acquisitions	2	16,700	0	0	0	16,702
Issuance of stock for acquisitions (in shares)	1,800,000
Net income	0	0	0	0	16,107	16,107
Foreign currency translation adjustment	0	0	(27)	0	0	(27)
Balance at Dec. 31, 2012	39	276,201	(306)	(62,970)	21,449	234,413
Balance (in shares) at Dec. 31, 2012	30,825,000
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	0	332	0	0	0	332
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan (in shares)	80,000
Net tax benefit from stock option exercises and restricted stock vesting	0	2,578	0	0	0	2,578
Stock compensation related to restricted stock vesting and retirement savings plan contributions	0	11,034	0	0	0	11,034
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	949,000
Purchases of treasury stock and buyback of shares for taxes	0	0	0	(18,081)	0	(18,081)
Purchases of treasury stock and buyback of shares for taxes (in shares)	(1,313,000)
Issuance of stock for acquisitions	2	7,852	0	0	0	7,854
Issuance of stock for acquisitions (in shares)	800,000
Net income	0	0	0	0	21,432	21,432
Foreign currency translation adjustment	0	0	(72)	0	0	(72)
Balance at Dec. 31, 2013	41	297,997	(378)	(81,051)	42,881	259,490
Balance (in shares) at Dec. 31, 2013	31,341,000					31,341,276
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan	0	1,451	0	0	0	1,451
Proceeds from the exercise of stock options and sales of stock through the Employee Stock Purchase Plan (in shares)	210,000
Net tax benefit from stock option exercises and restricted stock vesting	0	2,577	0	0	0	2,577
Stock compensation related to restricted stock vesting and retirement savings plan contributions	1	12,718	0	0	0	12,719
Stock compensation related to restricted stock vesting and retirement savings plan contributions (in shares)	961,000
Purchases of treasury stock and buyback of shares for taxes	0	0	0	(14,302)	0	(14,302)
Purchases of treasury stock and buyback of shares for taxes (in shares)	(807,000)
Issuance of stock for acquisitions	1	19,902	0	0	0	19,903
Issuance of stock for acquisitions (in shares)	1,150,000
Net income	0	0	0	0	23,163	23,163
Foreign currency translation adjustment	0	0	(273)	0	0	(273)
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