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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Expenses:        
Operating income $ 30,076 $ 16,790 $ 224,098 $ 18,752
Interest and debt expense, net (319) (861) (319) (1,851)
Diamond Green Diesel Holdings LLC Joint Venture [Member]        
Revenues:        
Operating revenues 151,989 150,786 302,310 276,183
Expenses:        
Total costs and expenses less depreciation, amortization and accretion expense 115,659 125,975 65,838 241,297
Depreciation, amortization and accretion expense 6,254 8,021 12,374 16,134
Total costs and expenses 121,913 133,996 78,212 257,431
Other income 415 328 792 551
Net income $ 30,172 $ 16,257 $ 224,571 $ 17,452