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Partners' Capital, Mezzanine Capital and Distributions (Preferred Cash Distributions Paid) (Details) - Preferred Unitholders - Class A Convertible Preferred Stock Units - USD ($) $ / shares in Units, $ in Thousands | Nov. 13, 2020 | Aug. 14, 2020 | May 15, 2020 | Feb. 14, 2020 | Nov. 14, 2019 | Aug. 14, 2019 | May 15, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Temporary Equity [Line Items] |  |  |  |  |  |  |
Date Paid |  | Aug. 14, 2020 | May 15, 2020 | Feb. 14, 2020 | Nov. 14, 2019 | Aug. 14, 2019 | May 15, 2019
Per Unit Amount (in dollars per unit) |  | $ 0.7374 | $ 0.7374 | $ 0.7374 | $ 0.7374 | $ 0.7374 | $ 0.2458
Total Amount |  | $ 18,684 | $ 18,684 | $ 18,684 | $ 18,684 | $ 18,684 | $ 6,138
Forecast | Subsequent Event |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Date Paid | Nov. 13, 2020 |  |  |  |  |  |
Per Unit Amount (in dollars per unit) | $ 0.7374 |  |  |  |  |  |
Total Amount | $ 18,684 |  |  |  |  |  |

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