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Property, Plant and Equipment (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Components of Railcar assets leased to others      
Railcar assets leased to others $ 332,997 $ 272,883 $ 248,030
Less accumulated depreciation 80,032 75,746 69,889
Railcar assets leased to others, net $ 252,965 $ 197,137 $ 178,141