SUBSEQUENT EVENTS (Details)	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jul. 31, 2012 Subsequent Event [Member]	Jun. 30, 2012 Subsequent Event [Member] USD ($)	Jul. 11, 2012 Subsequent Event [Member] USD ($)	Jul. 11, 2012 Subsequent Event [Member] Revolving Credit Facility [Member] USD ($)	Jul. 11, 2012 Subsequent Event [Member] Term Loan [Member] USD ($)	Jun. 30, 2012 Subsequent Event [Member] HSE Integrated Ltd. [Member] USD ($)	Jun. 30, 2011 Subsequent Event [Member] HSE Integrated Ltd. [Member] USD ($)	Jun. 30, 2012 Subsequent Event [Member] HSE Integrated Ltd. [Member] USD ($)	Jun. 30, 2011 Subsequent Event [Member] HSE Integrated Ltd. [Member] USD ($)	Jul. 11, 2012 Subsequent Event [Member] HSE Integrated Ltd. [Member] USD ($)	Jul. 11, 2012 Subsequent Event [Member] HSE Integrated Ltd. [Member] CAD
Subsequent Event [Line Items]
Acquisition price (in dollars per share)															1.80
Total transaction value														$ 85,000,000
Liabilities assumed on acquisition														4,000,000
Transaction costs														3,000,000
Borrowings under credit facility							325,000,000	225,000,000	100,000,000
Borrowings under amended credit facility								200,000,000
Line of credit facility, expiration date					Jul. 11, 2017
Debt issuance cost						700,000
Goodwill on acquisition										17,000,000		17,000,000
Purchase price allocation [Abstract]
Cash	696,000		696,000							11,000,000		11,000,000
Accounts Receivable, net	25,498,000		25,498,000							24,000,000		24,000,000
Inventory, net	15,856,000		15,856,000							0		0
Property and equipment	4,485,000		4,485,000							33,000,000		33,000,000
Goodwill and intangibles	68,793,000		68,793,000							47,000,000		47,000,000
Other assets	456,000		456,000							2,000,000		2,000,000
Assets acquired	115,784,000		115,784,000							117,000,000		117,000,000
Current liabilities assumed	(9,594,000)		(9,594,000)							(14,000,000)		(14,000,000)
Non current liabilities assumed	(5,142,000)		(5,142,000)							(18,000,000)		(18,000,000)
Net assets acquired	101,048,000		101,048,000							85,000,000		85,000,000
Pro Forma Information [Abstract]
Net sales	264,177,000	237,251,000	527,290,000	457,836,000						290,481,000	223,399,000	570,872,000	431,296,000
Net income	$ 12,139,000	$ 9,575,000	$ 24,317,000	$ 17,515,000						$ 12,696,000	$ 7,654,000	$ 25,588,000	$ 13,493,000
Per share data [Abstract]
Basic earnings (in dollars per share)	$ 0.84	$ 0.67	$ 1.69	$ 1.22						$ 0.88	$ 0.53	$ 1.78	$ 0.94
Diluted earnings (in dollars per share)	$ 0.80	$ 0.63	$ 1.60	$ 1.15						$ 0.83	$ 0.50	$ 1.68	$ 0.89