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Property, Plant and Equipment (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Components of Railcar assets leased to others      
Railcar assets leased to others $ 321,269 $ 310,614 $ 332,997
Less accumulated depreciation 78,382 82,284 80,032
Railcar assets leased to others, net $ 242,887 $ 228,330 $ 252,965