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Partners' Capital, Mezzanine Equity and Distributions (Preferred Cash Distributions Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands | Feb. 14, 2020 | Nov. 14, 2019 | Aug. 14, 2019 | May 15, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
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Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Per Unit Amount (in dollars per unit) | [1] |  |  |  |  | $ 0.5500 | $ 0.5500 | $ 0.5500 | $ 0.5500 | $ 0.5500 | $ 0.5400 | $ 0.5300 | $ 0.5200
Class A Convertible Preferred Units | Preferred Unitholders |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid |  |  | Nov. 14, 2019 | Aug. 14, 2019 | May 15, 2019 |  |  |  |  |  |  |  |
Per Unit Amount (in dollars per unit) |  |  | $ 0.7374 | $ 0.7374 | $ 0.2458 |  |  |  |  |  |  |  |
Total Amount |  |  | $ 18,684 | $ 18,684 | $ 6,138 |  |  |  |  |  |  |  |
Scenario, Forecast | Subsequent Event | Class A Convertible Preferred Units | Preferred Unitholders |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Date Paid |  | Feb. 14, 2020 |  |  |  |  |  |  |  |  |  |  |
Per Unit Amount (in dollars per unit) |  | $ 0.7374 |  |  |  |  |  |  |  |  |  |  |
Total Amount |  | $ 18,684 |  |  |  |  |  |  |  |  |  |  |
[1] | (1) Represents cash distributions declared and paid in the applicable period.

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