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Other Financial Statement Information (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Property and equipment - net    
Property and equipment - Gross $ 207,807 $ 198,701
Less accumulated depreciation 119,447 115,841
Property and equipment - net 88,360 82,860
Land and improvements [Member]
   
Property and equipment - net    
Property and equipment - Gross 12,920 10,283
Buildings and improvements [Member]
   
Property and equipment - net    
Property and equipment - Gross 57,942 56,303
Machinery and equipment [Member]
   
Property and equipment - net    
Property and equipment - Gross 128,664 125,668
Construction in progress [Member]
   
Property and equipment - net    
Property and equipment - Gross $ 8,281 $ 6,447