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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 152,514 $ 137,966
Less accumulated depreciation (61,779) (55,116)
Property, plant and equipment, net 90,735 82,850
Land and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 13,953 11,807
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 73,121 68,717
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 50,235 43,961
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 9,172 7,786
Software costs    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 6,033 $ 5,695