Other Assets - (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Summary of prepaid expense and other current assets | ||
| Commodity derivatives and related collateral, net | $ 7,127 | $ 10,097 |
| Prepaid expenses | 10,665 | 8,504 |
| Deposits | 2,897 | 3,824 |
| RIN inventory | 9,398 | 5,656 |
| Taxes receivable | 4,539 | 1,814 |
| Other | 1,646 | 1,987 |
| Total | $ 36,272 | $ 31,882 |