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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Expenses:        
Operating income $ 16,790 $ 29,114 $ 18,752 $ 42,995
Interest and debt expense, net (861) (1,928) (1,851) (4,742)
Diamond Green Diesel Holdings LLC Joint Venture [Member]        
Revenues:        
Operating revenues 150,786 132,226 276,183 203,994
Expenses:        
Total costs and expenses less depreciation, amortization and accretion expense 125,975 95,565 241,297 148,074
Depreciation, amortization and accretion expense 8,021 7,547 16,134 12,925
Total costs and expenses 133,996 103,112 257,431 160,999
Other income 328 70 551 85
Net income/(loss) $ 16,257 $ 27,256 $ 17,452 $ 38,338