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Other Financial Statement Information (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Property and equipment - net    
Property and equipment - Gross $ 224,190 $ 218,470
Less accumulated depreciation 127,247 125,144
Property and equipment - net 96,943 93,326
Land and improvements [Member]
   
Property and equipment - net    
Property and equipment - Gross 13,438 13,190
Buildings and improvements [Member]
   
Property and equipment - net    
Property and equipment - Gross 60,565 59,505
Machinery and equipment [Member]
   
Property and equipment - net    
Property and equipment - Gross 140,535 138,533
Construction in progress [Member]
   
Property and equipment - net    
Property and equipment - Gross $ 9,652 $ 7,242