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Property, Plant & Equipment (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Property, plant and equipment $ 134,353,000   $ 119,933,000
Accumulated depreciation (60,829,000)   (57,938,000)
Property, plant and equipment — net 73,524,000   61,995,000
Capital expenditures in progress 1,909,000   979,000
Capitalized interest expense 2,000 $ 45,000  
Commitments for capital expenditures in progress $ 1,412,000   $ 1,682,000