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Partners' Deficit (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 16, 2020
May 08, 2020
Feb. 07, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Limited Partners' Capital Account [Line Items]                  
Quarterly cash distribution to unitholders   $ 2,800 $ 11,300 $ 2,836 $ 11,280 $ 11,269 $ 11,269    
Distribution per unit               $ 0.46  
Distribution Made To Limited Partner And General Partner, Threshold In Days After End Of Each Calendar Quarter, Distribution Payment               45 days  
Declaration Date         Apr. 16, 2020     Jul. 16, 2020 Jan. 16, 2020
Record Date         May 01, 2020       Jan. 31, 2020
Payment Date         May 08, 2020       Feb. 07, 2020
Quarterly Distribution   $ 0.12 $ 0.475 $ 0.12 $ 0.475 $ 0.475 $ 0.475    
Payable Date               Aug. 07, 2020  
Close Of Business Date               Jul. 31, 2020  
Common Units [Member]                  
Limited Partners' Capital Account [Line Items]                  
Change in the number of common limited partner units outstanding               0  
Subsequent Event [Member]                  
Limited Partners' Capital Account [Line Items]                  
Quarterly cash distribution declared $ 2,800                
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.12                
Maximum [Member]                  
Limited Partners' Capital Account [Line Items]                  
Incentive distribution, percentage of available cash distributed from operating surplus               48.00%  
General Partner [Member]                  
Limited Partners' Capital Account [Line Items]                  
Quarterly cash distribution to unitholders       $ 57 $ 278 $ 278 $ 278    
Credit Facility [Member]                  
Limited Partners' Capital Account [Line Items]                  
Line of credit terms, maximum per unit quarterly payments               $ 0.12