Derivative Instruments - Gains (Losses) included in the Statements of Operations (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Cost of goods sold – Biomass-based diesel | Commodity derivatives | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Pre-tax gains (losses) included in the condensed consolidated statement of operations | $ (35,386) | $ 35,983 | $ 61,631 |