Property, Plant and Equipment (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Components of Railcar assets leased to others
Railcar assets leased to others	$ 436,948	$ 434,051	$ 402,509
Less: accumulated depreciation	99,287	95,940	89,414
Railcar assets leased to others, net	$ 337,661	$ 338,111	$ 313,095