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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Expenses: |  |
Operating income | $ 194,022 | $ 1,962
Interest and debt expense, net | 0 | (990)
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |
Revenues: |  |
Operating revenues | 150,321 | 125,397
Expenses: |  |
Total costs and expenses less depreciation, amortization and accretion expense | (49,821) | 115,322
Depreciation, amortization and accretion expense | 6,120 | 8,113
Total costs and expenses | (43,701) | 123,435
Other income | 377 | 223
Net income | $ 194,399 | $ 1,195

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