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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Expenses: |  |  |  |
Operating income | $ 37,642 | $ (21,578) | $ 80,637 | $ (11,033)
Interest and debt expense, net | (1,406) | (3,122) | (6,148) | (10,629)
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |  |
Revenues: |  |  |  |
Operating revenues | 141,656 | 107,160 | 345,650 | 380,048
Expenses: |  |  |  |
Total costs and expenses less depreciation, amortization and accretion expense | 96,569 | 123,779 | 244,643 | 376,157
Depreciation, amortization and accretion expense | 7,445 | 4,959 | 20,370 | 14,924
Total costs and expenses | 104,014 | 128,738 | 265,013 | 391,081
Other income | 114 | 41 | 199 | 93
Net income/(loss) | $ 36,350 | $ (24,659) | $ 74,688 | $ (21,569)

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