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Partners' Capital, Mezzanine Capital and Distributions (Preferred Cash Distributions Paid) (Details) - Preferred Unitholders - Class A Convertible Preferred Stock Units - USD ($)
$ / shares in Units, $ in Thousands
Aug. 14, 2019
May 15, 2019
Temporary Equity [Line Items]    
Date Paid   May 15, 2019
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest   $ 0.2458
Total Amount   $ 6,138
Forecast | Subsequent Event    
Temporary Equity [Line Items]    
Date Paid Aug. 14, 2019  
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest $ 0.7374  
Total Amount $ 18,684