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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property Plant And Equipment Gross Abstract    
Land $ 8,346 $ 8,198
Building and Improvements 72,292 71,029
Machinery and Equipment 134,754 130,939
Construction In Progress 9,785 4,529
Property, Plant and Equipment, Gross, Total 225,177 214,695
Less: Accumulated Depreciation (140,065) (131,779)
Property, Plant and Equipment, Net, Total $ 85,112 $ 82,916