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Property, Plant & Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property, Plant & Equipment:    
Property, plant and equipment $ 109,407 $ 99,747
Accumulated depreciation (52,929) (48,189)
Property, plant and equipment — net 56,478 51,558
Commitments for capital expenditures in progress recorded on balance sheet 4,629 662
Capitalized interest expense 63 174
Accounts payable
    
Property, Plant & Equipment:    
Commitments for capital expenditures in progress recorded on balance sheet 709 241
Land and land improvements
    
Property, Plant & Equipment:    
Property, plant and equipment 5,098 5,098
Buildings
    
Property, Plant & Equipment:    
Property, plant and equipment 36,651 36,556
Machinery and equipment
    
Property, Plant & Equipment:    
Property, plant and equipment 60,897 56,831
Tools, dies and patterns
    
Property, Plant & Equipment:    
Property, plant and equipment 808 808
Additions in progress
    
Property, Plant & Equipment:    
Property, plant and equipment $ 5,953 $ 454