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Property, Plant & Equipment (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, plant and equipment $ 114,127,000   $ 109,407,000
Accumulated depreciation (54,269,000)   (52,929,000)
Property, plant and equipment — net 59,858,000   56,478,000
Capital expenditures in progress 7,955,000   5,953,000
Capitalized interest expense 22,000 0  
Commitments for capital expenditures in progress $ 5,868,000   $ 4,629,000