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Partners' Capital, Mezzanine Equity and Distributions (Preferred Distributions Paid in Kind) (Details) - Class A Convertible Preferred Units - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 15, 2019 | Feb. 14, 2019 | Dec. 31, 2019
Distribution Made to Limited Partner [Line Items] |  |  |
Date Issued | May 15, 2019 | Feb. 14, 2019 |
Number of Units (in units) | 364,180 | 534,576 | 898,756
Total Amount | $ 12,277 | $ 18,021 | $ 30,298

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