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Property, Plant & Equipment (Details) - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Property, plant and equipment $ 139,209,000   $ 137,996,000
Accumulated depreciation (67,111,000)   (63,893,000)
Property, plant and equipment — net 72,098,000   74,103,000
Capital expenditures in progress 841,000   2,331,000
Capitalized interest expense 0 $ 2,000  
Commitments for capital expenditures in progress $ 672,000   $ 1,102,000