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Unit-Based Compensation (Details) - LTIP - $ / shares
1 Months Ended 3 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Units available for issuance     953,017
Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Restricted Units, Outstanding     1,155,467
Number of Restricted Units, Vested     (241,826)
Number of Restricted Units, Returned/Cancelled     (112,206)
Number of Restricted Units, Outstanding     801,435
Weighted Averaged Grant Date Fair Value Per Unit, Outstanding     $ 3.86
Weighted Averaged Grant Date Fair Value Per Unit, Vested     2.37
Weighted Averaged Grant Date Fair Value Per Unit, Returned/Cancelled     4.40
Weighted Averaged Grant Date Fair Value Per Unit, Outstanding     $ 4.24
Restricted Stock Units (RSUs) | Directors      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Restricted Units, Granted 137,613 991,560