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Property, Plant & Equipment (Details) (USD $)
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Abstract]      
Property, plant and equipment $ 116,886,000   $ 109,407,000
Accumulated depreciation (55,609,000)   (52,929,000)
Property, plant and equipment — net 61,277,000   56,478,000
Capital expenditures in progress 7,053,000   5,953,000
Capitalized interest expense 45,000 13,000  
Commitments for capital expenditures in progress $ 2,385,000   $ 4,629,000