PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 86,867	$ 81,343
Less: Accumulated depreciation	42,585	37,955
Property, plant and equipment, net	44,282	43,388
Depreciation expense	5,323	4,644	4,480
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,971	2,002
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,680	15,589
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	66,584	58,018
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,632	$ 5,734