Property, Plant and Equipment (Details 1) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Components of Railcar assets leased to others
Railcar assets leased to others	$ 422,810	$ 384,958	$ 323,881
Less: accumulated depreciation	91,978	87,211	81,734
Railcar assets leased to others, net	$ 330,832	$ 297,747	$ 242,147