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Equity and Distributions, Distributions (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Distributions to Partners [Abstract]        
Quarterly percentage increase in distribution per unit 2.30%      
Forecast [Member]        
Distributions to Partners [Abstract]        
Quarterly increase in cash distribution per unit (in dollars per unit)     $ 0.0025  
Forecasted rate of annual increase of distributions per unit     2.30%  
Cash Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)       $ 1.7250
Cash Distribution [Member] | First Quarter 2018 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)   $ 0.4275    
Cash Distribution [Member] | First Quarter 2019 Distribution [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit) $ 0.4375      
Record Date Apr. 30, 2019      
Payment Date May 13, 2019      
Cash Distribution [Member] | Forecast [Member]        
Distributions to Partners [Abstract]        
Distribution Per Common Unit (in dollars per unit)     $ 1.7650