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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