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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Expenses: |  |  |  |
Operating income | $ 75,873 | $ 30,076 | $ 124,110 | $ 224,098
Interest and debt expense, net | (321) | (319) | (645) | (319)
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |  |
Revenues: |  |  |  |
Operating revenues | 294,811 | 151,989 | 597,529 | 302,310
Expenses: |  |  |  |
Total costs and expenses less depreciation, amortization and accretion expense | 207,024 | 115,659 | 450,087 | 65,838
Depreciation, amortization and accretion expense | 11,914 | 6,254 | 23,332 | 12,374
Total costs and expenses | 218,938 | 121,913 | 473,419 | 78,212
Other income | 634 | 415 | 1,275 | 792
Net income | $ 76,186 | $ 30,172 | $ 124,740 | $ 224,571

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