SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant, and Equipment (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 122,232	$ 97,907
Less accumulated depreciation	(62,619)	(58,432)
Property, plant and equipment, net	59,613	39,475
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,027	5,812
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	57,697	42,230
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34,984	30,821
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,243	8,978
Software costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 10,281	$ 10,066