Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 02, 2011 Ash [Member]	Jun. 30, 2011 Ostial [Member]	Jun. 30, 2011 Ostial [Member]	Jan. 30, 2012 Ostial [Member]	Sep. 02, 2011 Developed Technology Rights [Member] Ash [Member]	Jan. 30, 2012 Developed Technology Rights [Member] Ostial [Member]	Sep. 02, 2011 Customer Lists [Member] Ash [Member]	Jan. 30, 2012 Customer Lists [Member] Ostial [Member]	Jan. 30, 2012 Trade Names [Member] Ostial [Member]	Jan. 30, 2012 Noncompete Agreements [Member] Ostial [Member]
Business Acquisition [Line Items]
Property and equipment					$ 73
Intangibles									3,200	16,200	300	700	150	20
Goodwill					2,697			4,430
Business Acquisition, Purchase Price Allocation, Assets Acquired					6,270			21,500
NET SALES	100,532	91,249	196,150	177,880
Net Sales, Pro Forma						91,325	178,009
Net income	6,095	6,872	11,843	13,511
Net Income, Pro Forma						$ 6,532	$ 12,804
Basic (in dollars per share)	$ 0.14	$ 0.19	$ 0.28	$ 0.37
Basic, Pro Forma (in dollars per share)						$ 0.18	$ 0.35
Diluted (in dollars per share)	$ 0.14	$ 0.18	$ 0.28	$ 0.37
Dilued, Pro Forma (in dollars per share)						$ 0.17	$ 0.35