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Property, Plant & Equipment (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Property, plant and equipment $ 142,915,000 $ 140,658,000
Accumulated depreciation (74,804,000) (70,057,000)
Property, plant and equipment — net 68,111,000 70,601,000
Capital expenditures in progress 2,014,000 1,607,000
Commitments for capital expenditures in progress $ 880,000 $ 616,000