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Partners' Capital, Mezzanine Equity and Distributions (Paid in Kind Distributions Paid) (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 14, 2018 | Aug. 14, 2018 | May 15, 2018 | Feb. 14, 2018 | Nov. 14, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |
Date Issued | Nov. 14, 2018 | Aug. 14, 2018 | May 15, 2018 | Feb. 14, 2018 | Nov. 14, 2017 |  |  |
Class A Convertible Preferred Stock Units |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |
Number of Units (in units) | 523,132 | 511,934 | 500,976 | 490,252 | 162,234 | 534,576 | 2,026,294 | 162,234
Total Amount | $ 17,635 | $ 17,257 | $ 16,888 | $ 16,526 | $ 5,469 |  | $ 68,306 | $ 5,469

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