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Property, Plant and Equipment (Rail Group Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Components of Railcar assets leased to others      
Rail Group assets leased to others, gross $ 699,972 $ 640,349 $ 576,622
Less: accumulated depreciation 134,226 118,564 111,846
Railcar assets leased to others, net $ 565,746 $ 521,785 $ 464,776