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Partners' Capital, Mezzanine Equity and Distributions (Change in Class A Convertible Preferred Units) (Details) - Class A Convertible Preferred Units - USD ($)
$ in Thousands
12 Months Ended
May 15, 2019
Feb. 14, 2019
Dec. 31, 2019
Units      
Beginning Balance (in units)     24,438,022
Distribution paid-in-kind (in units) 364,180 534,576 898,756
Allocation of Distributions paid-kind to Preferred Distribution Rate Reset Election (in units)     0
Ending Balance (in units)     25,336,778
Amount      
Beginning Balance     $ 761,466
Distributions paid-in-kind $ 12,277 $ 18,021 30,298
Allocation of Distribution paid-kind to Preferred Distribution Rate Reset Election     (1,649)
Ending Balance     $ 790,115