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Property, Plant and Equipment (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Components of Railcar assets leased to others      
Railcar assets leased to others $ 441,267 $ 384,958 $ 330,318
Less: accumulated depreciation 94,167 87,211 84,469
Railcar assets leased to others, net $ 347,100 $ 297,747 $ 245,849