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Accounting Policies and Basis of Presentation - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) rail_car office_space | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) rail_car office_space | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Accounting Policies [Abstract] |  |  |  |  |
Shipping and handling revenue | $ 3,463 | $ 3,939 | $ 7,078 | $ 8,076 |
Debt instrument, fair value disclosure | 44,372 |  | 44,372 |  | $ 37,412
Long-term debt | 43,732 |  | 43,732 |  | 36,001
Unamortized loan fees | $ 485 |  | $ 485 |  | $ 576
Property under operating lease | Rail cars |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Property subject to operating leases, number of units | rail_car | 224 |  | 224 |  |
Property under operating lease | Office space |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Property subject to operating leases, number of units | office_space | 1 |  | 1 |  |

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