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Investment in Unconsolidated Subsidiary Selected Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Assets: |  |  |  |
Property, plant and equipment, net |  | $ 354,871 |  | $ 435,328
Total assets |  | 635,769 |  | 642,761
Liabilities and members' equity: |  |  |  |
Total current portion of long term debt |  | 17,023 |  | 17,023
Total long term debt |  | 53,753 |  | 36,730
Total members' equity |  | 541,375 |  | 547,853
Expenses: |  |  |  |
Operating income | $ 57,441 | 146,627 | $ 157,274 |
Interest and debt expense, net | (2,306) | (7,354) | (13,604) |
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |  |
Assets: |  |  |  |
Total current assets |  | 268,734 |  | 202,778
Other assets |  | 12,164 |  | 4,655
Liabilities and members' equity: |  |  |  |
Total other current liabilities |  | 23,200 |  | 40,705
Total other long term liabilities |  | 418 |  | 450
Total liabilities and member's equity |  | 635,769 |  | $ 642,761
Revenues: |  |  |  |
Operating revenues | 633,908 | 527,670 | 475,934 |
Equity Method Investment, Summarized Financial Information, Total Costs and Expenses Less Depreciation, Amortization and Accretion Expense | 547,512 | 353,222 | 298,946 |
Equity Method Investment, Summarized Financial Information, Depreciation, Amortization and Accretion Expense | 28,955 | 27,821 | 19,714 |
Expenses: |  |  |  |
Other income | 1,343 | 551 | 120 |
Net income | $ 56,478 | $ 139,824 | $ 143,790 |

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