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Sale of Properties (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Property
Dec. 31, 2011
Dec. 31, 2010
Sale of Properties [Abstract]      
Properties Sold 4    
Proceeds from Sale of Property, Plant, and Equipment $ 12,278 $ 0 $ 2,027
Gain (Loss) on Disposition of Property $ 3,721 $ (22) $ 1,701