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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Expenses: |  |  |  |
Operating income | $ (5,499) | $ 14,406 | $ 218,599 | $ 33,158
Interest and debt expense, net | (318) | (455) | (637) | (2,306)
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |  |
Revenues: |  |  |  |
Operating revenues | 104,811 | 175,585 | 407,121 | 451,768
Expenses: |  |  |  |
Total costs and expenses less depreciation, amortization and accretion expense | 103,794 | 154,446 | 169,632 | 395,743
Depreciation, amortization and accretion expense | 6,516 | 6,733 | 18,890 | 22,867
Total costs and expenses | 110,310 | 161,179 | 188,522 | 418,610
Other income | 556 | 408 | 1,348 | 959
Net income | $ (5,261) | $ 14,359 | $ 219,310 | $ 31,811

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