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Partners' Capital, Mezzanine Equity and Distributions (Change in Class A Convertible Preferred Units) (Details) - USD ($)
$ in Thousands
12 Months Ended
May 15, 2019
Feb. 14, 2019
Nov. 14, 2018
Aug. 14, 2018
May 15, 2018
Feb. 14, 2018
Nov. 14, 2017
Sep. 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amount                      
Beginning Balance                 $ 761,466    
Ending Balance                 $ 790,115 $ 761,466  
Class A Convertible Preferred Units                      
Units                      
Beginning Balance (in units)                 24,438,022 22,411,728 0
Issuance of Preferred Units, net (in units)                     22,249,494
Allocation to Preferred Distribution Rate Reset Election (in units)                     0
Distribution paid-in-kind (in units) 364,180 534,576 523,132 511,934 500,967 490,252 162,234   898,756 2,026,294 162,234
Allocation of Distributions paid-kind to Preferred Distribution Rate Reset Election (in units)                 0 0 0
Ending Balance (in units)                 25,336,778 24,438,022 22,411,728
Amount                      
Beginning Balance                 $ 761,466 $ 697,151 $ 0
Issuance of Preferred Units, net               $ 726,419     726,419
Allocation to Preferred Distribution Rate Reset Election                     (34,450)
Distributions paid-in-kind $ 12,277 $ 18,021 $ 17,635 $ 17,257 $ 16,888 $ 16,526 $ 5,469   30,298 68,306 5,469
Allocation of Distribution paid-kind to Preferred Distribution Rate Reset Election                 (1,649) (3,991) (287)
Ending Balance               $ 726,419 $ 790,115 $ 761,466 $ 697,151