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Cash distributions and earnings per unit (Tables)
6 Months Ended
Jun. 30, 2023
Cash Distributions And Earnings Per Unit  
Cash Distributions and Earnings per Unit - Schedule of Incentive Distributions Made To General Partners Or Unitholders By Distribution

      Marginal Percentage Interest in Distributions
  Total Quarterly Distribution Target Amount   Common
Unitholders
  Incentive Distribution Right Holder   General
Partner
Minimum Quarterly Distribution up to $5.25   98%        2%
First Target Distribution up to $6.0375   98%        2%
Second Target Distribution above $ 6.0375 up to $6.5625   85%   13%   2%
Third Target Distribution above $6.5625 up to $7.875   75%   23%   2%
Thereafter above $7.875   50%   48%   2%
Cash distribution and earnings per unit - Schedule of earnings per unit, Basic and Diluted

  Three Month Period Ended   Three Month Period Ended   Six Month Period Ended   Six Month Period Ended
June 30, 2023 June 30, 2022 June 30, 2023 June 30, 2022
  (unaudited) (unaudited) (unaudited) (unaudited)
Net income $ 112,308   $ 118,160   $ 211,473   $ 203,825
Income attributable to:                      
Common unitholders $ 110,062   $ 115,797   $ 207,245   $ 199,749
Weighted average units outstanding basic                      
Common unitholders   30,183,387     30,154,171     30,183,387     30,154,171
Earnings per unit basic:                      
Common unitholders $ 3.65   $ 3.84   $ 6.87   $ 6.62
Weighted average units outstanding diluted                      
Common unitholders   30,184,388     30,197,087     30,184,388     30,197,087
Earnings per unit diluted:                      
Common unitholders $ 3.65   $ 3.83   $ 6.87   $ 6.61
Earnings per unit distributed basic:                      
Common unitholders $ 0.05   $ 0.05   $ 0.10   $ 0.10
Earnings per unit distributed diluted:                      
Common unitholders $ 0.05   $ 0.05   $ 0.10   $ 0.10