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Equity - Cash distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 08, 2022
Nov. 10, 2021
Aug. 11, 2021
May 14, 2021
Feb. 09, 2021
Nov. 12, 2020
Aug. 12, 2020
May 12, 2020
Feb. 12, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit   $ 0.950 $ 0.940 $ 0.920 $ 0.910 $ 0.905 $ 0.900 $ 0.890 $ 0.885      
Total Cash Distribution, including general partner interest and IDRs (in thousands)   $ 41,286 $ 40,846 $ 39,968 $ 39,533 $ 39,308 $ 35,969 $ 30,878 $ 30,634 $ 161,600 $ 136,800 $ 113,700
General partner's IDRs                   0 17,632 31,781
Total cash distributions                   $ 164,484 $ 145,688 $ 117,365
Cash distributions per limited partner unit (in dollars per unit)                   $ 3.785 $ 3.605 $ 3.440
Subsequent Event                        
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit $ 0.975                      
Total Cash Distribution, including general partner interest and IDRs (in thousands) $ 42,384                      
General Partner                        
Distribution Made to Limited Partner [Line Items]                        
General partner's distributions                   $ 0 $ 986 $ 1,711
General partner's IDRs                   0 17,632 31,781
Total general partner's distributions                   0 18,618 33,492
Limited Partner                        
Distribution Made to Limited Partner [Line Items]                        
Common limited partners' distributions                   $ 164,484 $ 127,070 $ 83,873