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Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Expenses:    
Operating income $ 1,962 $ 13,881
Interest and debt expense, net (990) (2,814)
Diamond Green Diesel Holdings LLC Joint Venture [Member]    
Revenues:    
Operating revenues 125,397 71,768
Expenses:    
Total costs and expenses less depreciation, amortization and accretion expense 115,322 52,509
Depreciation, amortization and accretion expense 8,113 5,378
Total costs and expenses 123,435 57,887
Other income 223 15
Net income/(loss) $ 1,195 $ 11,082