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Commitments and Contingencies (Details Textual) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2015 | Dec. 31, 2016 USD ($) Joint_Venture | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Lease income per diem arrangements recognized |  | $ 4.9 | $ 5.0 | $ 3.4
Management and service fees |  | 5.7 | 7.0 | 8.4
Rental expense under agreements net |  | 12.3 | 10.9 | 8.9
Future minimum lease payments, 2017 |  | 5.5 |  |
Future minimum lease payments, 2018 |  | 4.6 |  |
Future minimum lease payments, 2019 |  | 3.8 |  |
Future minimum lease payments, 2020 |  | 3.3 |  |
Future minimum lease payments, 2021 |  | 3.0 |  |
Future minimum lease payments, thereafter |  | $ 0.3 |  |
Number of ethanol joint ventures | Joint_Venture |  | 2 |  |
Periods of lease income renewals |  | 7 years 6 months |  |
Operating lease income |  | $ 2.0 | $ 2.0 | $ 2.0
Build-to-Suit Lease |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lease agreement initial term of contract | 15 years |  |  |
Build-to-Suit Lease | Other Long-term Liabilities |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Built-to-suit financial obligation |  | 14.0 |  |
Build-to-Suit Lease | Other Current Liabilities |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Built-to-suit financial obligation |  | $ 0.9 |  |

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