Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Summary of future contractual minimum rental revenues required under non-cancellable operating leases for railcars
Remaining 3 months of 2014	$ 20,777
2015	59,243
2016	57,525
2017	43,376
2018	31,475
2019 and thereafter	47,670
Total	260,066
Lease Fleet Financing [Member]
Summary of future contractual minimum rental revenues required under non-cancellable operating leases for railcars
Remaining 3 months of 2014	9,051
2015	35,862
2016	35,074
2017	26,433
2018	16,984
2019 and thereafter	31,649
Total	$ 155,053