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Other Financial Statement Information (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property and equipment - net    
Property and equipment - Gross $ 218,470 $ 198,701
Less accumulated depreciation 125,144 115,841
Property and equipment - net 93,326 82,860
Land and improvements [Member]
   
Property and equipment - net    
Property and equipment - Gross 13,190 10,283
Buildings and improvements [Member]
   
Property and equipment - net    
Property and equipment - Gross 59,505 56,303
Machinery and equipment [Member]
   
Property and equipment - net    
Property and equipment - Gross 138,533 125,668
Construction in progress [Member]
   
Property and equipment - net    
Property and equipment - Gross $ 7,242 $ 6,447