Long-term Debt (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Summary of future contractual minimum rental revenues required under non-cancellable operating leases for railcars
2016	$ 127,655
2017	112,673
2018	99,198
2019	80,841
2020	46,098
2021 and thereafter	57,879
Total	524,344
Lease Fleet Financing [Member]
Summary of future contractual minimum rental revenues required under non-cancellable operating leases for railcars
2016	83,293
2017	68,352
2018	55,015
2019	39,609
2020	21,079
2021 and thereafter	22,528
Total	$ 289,876