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Investment in Unconsolidated Subsidiary (Selected Financial Information) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | $ 628,665 |  | $ 620,708
Partners' Capital | 462,633 |  | 451,551
Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations before Extraordinary Items | 13,881 | $ (316) |
Equity Method Investment, Summarized Financial Information, Interest and Debt, Expense, Net | (2,814) | (4,156) |
Equity Method Investment, Summarized Financial Information, Property, Plant and Equipment, Net | 356,746 |  | 356,230
Equity Method Investment, Summarized Financial Information, Current Portion of Long Term Debt | 62,023 |  | 62,023
Equity Method Investment, Summarized Financial Information, Total Long Term Debt | 82,563 |  | 86,819
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Summarized Financial Information, Current Assets | 252,137 |  | 261,444
Revenues | 71,768 | 116,728 |
Net Income | 11,082 | (4,452) |
Equity Method Investment, Summarized Financial Information, Cost of Sales | 57,887 | 117,044 |
Equity Method Investment, Summarized Financial Information, Other Income | 15 | $ 20 |
Equity Method Investment, Summarized Financial Information, Other Assets | 19,782 |  | 3,034
Equity Method Investment, Summarized Financial Information, Other Current Liabilities | 21,056 |  | 19,935
Equity Method Investment, Summarized Financial Information, Other Long Term Liabilities | 390 |  | 380
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | $ 628,665 |  | $ 620,708

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