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Property, Plant and Equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 659,349,000 $ 587,323,000  
Accumulated depreciation and amortization of property, plant and equipment (334,417,000) (314,044,000)  
Property, plant and equipment, net 324,932,000 273,279,000  
Property, plant and equipment retirements and disposals 19,000,000 6,000,000 6,000,000
Land and land improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 37,156,000 35,734,000  
Buildings and leasehold improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 205,638,000 196,554,000  
Production and other equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 336,135,000 317,285,000  
Construction in progress [Member]
      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 80,420,000 $ 37,750,000