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Unit-Based Compensation (Restricted Units Activity) (Details) - LTIP - $ / shares
1 Months Ended 9 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Units available for issuance     838,446
Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Restricted Units, Outstanding     513,694
Number of Restricted Units, Granted     1,129,173
Number of Restricted Units, Vested     (381,729)
Number of Restricted Units, Returned/Cancelled     (102,345)
Number of Restricted Units, Outstanding     1,158,793
Weighted Averaged Grant Date Fair Value Per Unit, Outstanding     $ 12.31
Weighted Averaged Grant Date Fair Value Per Unit, Granted     2.35
Weighted Averaged Grant Date Fair Value Per Unit, Vested     8.49
Weighted Averaged Grant Date Fair Value Per Unit, Returned/Cancelled     12.05
Weighted Averaged Grant Date Fair Value Per Unit, Outstanding     $ 3.88
Restricted Stock Units (RSUs) | Director      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Restricted Units, Granted 137,613 991,560