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Partners' Capital, Mezzanine Capital and Distributions (Distributions Paid-in-kind) (Details) - Class A Convertible Preferred Stock Units - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 15, 2019 | Feb. 14, 2019 | Nov. 14, 2018 | Aug. 14, 2018 | May 15, 2018 | Mar. 31, 2019 | Sep. 30, 2019
Temporary Equity [Line Items] |  |  |  |  |  |  |
Date Issued | May 15, 2019 | Feb. 14, 2019 | Nov. 14, 2018 | Aug. 14, 2018 | May 15, 2018 |  |
Number of Units (in units) | 364,180 | 534,576 | 523,132 | 511,934 | 500,976 | 364,180 | 898,756
Total Amount | $ 12,277 | $ 18,021 | $ 17,635 | $ 17,527 | $ 16,888 |  | $ 30,298

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