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Partners' Capital, Mezzanine Equity and Distributions (Paid in Kind Distributions Paid) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 14, 2018
Aug. 14, 2018
May 15, 2018
Feb. 14, 2018
Nov. 14, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Distribution Made to Limited Partner [Line Items]                
Date Issued Nov. 14, 2018 Aug. 14, 2018 May 15, 2018 Feb. 14, 2018 Nov. 14, 2017      
Class A Convertible Preferred Stock Units                
Distribution Made to Limited Partner [Line Items]                
Number of Units (in units) 523,132 511,934 500,976 490,252 162,234 534,576 2,026,294 162,234
Total Amount $ 17,635 $ 17,257 $ 16,888 $ 16,526 $ 5,469   $ 68,306 $ 5,469