SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant, and Equipment (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 97,907	$ 87,355
Less accumulated depreciation	(58,432)	(55,305)
Property, plant and equipment, net	39,475	32,050
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,812	5,223
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	42,230	34,478
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,821	30,143
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,978	8,590
Software costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 10,066	$ 8,921