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Consolidated Statements of Changes in Partners' Capital (Parenthetical) - $ / shares
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Partnership units distributions per unit $ 0.13 $ 0.13 $ 0.125 $ 0.12 $ 0.12 $ 0.115
Series B Preferred Units [Member]            
Preferred units distributions per unit 0.50 0.50 0.50 0.50 0.50 0.50
Series C Preferred Units [Member]            
Preferred units distributions per unit 0.492188 0.492188 $ 0.492188 $ 0.492188 $ 0.492188 $ 0.492188
Series D Preferred Units [Member]            
Preferred units distributions per unit $ 0.515625 $ 0.41823