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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Expenses:    
Operating income $ 48,237 $ 194,022
Interest and debt expense, net (324) 0
Diamond Green Diesel Holdings LLC Joint Venture [Member]    
Revenues:    
Operating revenues 302,718 150,321
Expenses:    
Total costs and expenses less depreciation, amortization and accretion expense 243,063 (49,821)
Depreciation, amortization and accretion expense 11,418 6,120
Total costs and expenses 254,481 (43,701)
Other income 641 377
Net income $ 48,554 $ 194,399