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Balance Sheet Information (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment      
Gross property, plant, and equipment at cost $ 180,701,000 $ 177,860,000  
Less accumulated depreciation and amortization 91,562,000 79,558,000  
Net property, plant, and equipment at cost 89,139,000 98,302,000  
Depreciation expense 12,900,000 11,300,000 8,200,000
Land
      
Property, Plant and Equipment      
Gross property, plant, and equipment at cost 12,535,000 12,535,000  
Building and improvements
      
Property, Plant and Equipment      
Gross property, plant, and equipment at cost 52,050,000 49,498,000  
Building and improvements | Minimum
      
Property, Plant and Equipment      
Estimated useful lives 10 years    
Building and improvements | Maximum
      
Property, Plant and Equipment      
Estimated useful lives 40 years    
Machinery and equipment
      
Property, Plant and Equipment      
Gross property, plant, and equipment at cost 110,228,000 110,150,000  
Machinery and equipment | Minimum
      
Property, Plant and Equipment      
Estimated useful lives 3 years    
Machinery and equipment | Maximum
      
Property, Plant and Equipment      
Estimated useful lives 10 years    
Leaseholds improvements
      
Property, Plant and Equipment      
Gross property, plant, and equipment at cost $ 5,888,000 $ 5,677,000  
Leaseholds improvements | Minimum
      
Property, Plant and Equipment      
Estimated useful lives 3 years    
Leaseholds improvements | Maximum
      
Property, Plant and Equipment      
Estimated useful lives 7 years