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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 205,953 $ 195,299
Less: accumulated depreciation 66,204 63,711
Property, plant and equipment, net 139,749 131,588
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,022 3,130
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 30,819 31,030
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 148,987 150,170
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 23,125 $ 10,969