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Partners' Capital, Mezzanine Capital and Distributions (Common Cash Distributions Paid) (Details) - Common Unitholders - USD ($)
$ / shares in Units, $ in Thousands
May 14, 2021
Feb. 12, 2021
Nov. 13, 2020
Aug. 14, 2020
May 15, 2020
Partners Capital And Distributions [Line Items]          
Date Paid   Feb. 12, 2021 Nov. 13, 2020 Aug. 14, 2020 May 15, 2020
Per Unit Amount (in dollars per unit)   $ 0.15 $ 0.15   $ 0.15
Total Amount   $ 18,387 $ 18,387 $ 18,387 $ 18,387
Subsequent Event | Forecast          
Partners Capital And Distributions [Line Items]          
Date Paid May 14, 2021        
Per Unit Amount (in dollars per unit) $ 0.15        
Total Amount $ 18,387