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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, plant and equipment          
Property, plant and equipment, gross $ 78,852   $ 78,852   $ 73,685
Less accumulated depreciation (38,737)   (38,737)   (35,282)
Property, plant and equipment, net 40,115   40,115   38,403
Depreciation expense 1,953 $ 1,711 3,860 $ 3,368  
Land          
Property, plant and equipment          
Property, plant and equipment, gross 986   986   993
Building and improvements          
Property, plant and equipment          
Property, plant and equipment, gross 11,003   11,003   10,678
Machinery, equipment, tools and dies          
Property, plant and equipment          
Property, plant and equipment, gross 53,028   53,028   49,083
Furniture, fixtures and other          
Property, plant and equipment          
Property, plant and equipment, gross $ 13,835   $ 13,835   $ 12,931