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Property, Plant and Equipment (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components of Railcar assets leased to others    
Railcar assets leased to others $ 310,614 $ 272,883
Less: accumulated depreciation 82,284 75,746
Railcar assets leased to others, net $ 228,330 $ 197,137