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Sale of Properties (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2013
Property
Dec. 31, 2012
Dec. 31, 2011
Sale of Properties [Abstract]          
Properties Sold     4    
Proceeds from Sale of Property, Plant, and Equipment     $ 38 $ 12,278 $ 0
Gain (Loss) on Disposition of Property $ 1,600 $ 2,100 $ 4 $ 3,721 $ (22)