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Partners' Capital, Mezzanine Capital and Distributions (Change in Class A Convertible Preferred Units) (Details) - USD ($)
$ in Thousands
6 Months Ended
May 15, 2019
Feb. 14, 2019
Nov. 14, 2018
Aug. 14, 2018
May 15, 2018
Jun. 30, 2019
Class A Convertible Preferred Units (in units)            
Balance as of December 31, 2018 (in units)           24,438,022
Balance as of June 30, 2019 (in units)           25,336,778
Class A Convertible Preferred Units Balance            
Balance as of December 31, 2018           $ 761,466
Balance as of June 30, 2019           $ 790,115
Class A Convertible Preferred Units            
Class A Convertible Preferred Units (in units)            
Balance as of December 31, 2018 (in units)           24,438,022
Distributions paid-in-kind (in units) 364,180 534,576 523,132 511,934 500,976 898,756
Allocation of Distributions paid in-kind to Preferred Distribution Rate Reset Election           0
Balance as of June 30, 2019 (in units)           25,336,778
Class A Convertible Preferred Units Balance            
Balance as of December 31, 2018           $ 761,466
Distributions paid-in-kind $ 12,277 $ 18,021 $ 17,635 $ 17,527 $ 16,888 30,298
Allocation of Distributions paid in-kind to Preferred Distribution Rate Reset Election           (1,649)
Balance as of June 30, 2019           $ 790,115