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Equity - Cash distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 09, 2021
Nov. 12, 2020
Aug. 12, 2020
May 12, 2020
Feb. 12, 2020
Nov. 12, 2019
Aug. 13, 2019
May 14, 2019
Feb. 12, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit   $ 0.905 $ 0.900 $ 0.890 $ 0.885 $ 0.880 $ 0.850 $ 0.820 $ 0.810      
Total Quarterly Distribution Per Limited Partner Unit, Annualized   $ 3.62 $ 3.60 $ 3.56 $ 3.54 $ 3.52 $ 3.40 $ 3.28 $ 3.24      
Total Cash Distribution, including general partner interest and IDRs (in thousands)   $ 39,308 $ 35,969 $ 30,878 $ 30,634 $ 30,379 $ 28,914 $ 27,438 $ 26,949 $ 136,800 $ 113,700 $ 97,700
Less: General partner's IDRs                   17,632 31,781 24,224
Total cash distributions                   $ 145,688 $ 117,365 $ 101,890
Cash distributions per limited partner unit (in usd per unit)                   $ 3.605 $ 3.440 $ 3.120
Subsequent Event                        
Distribution Made to Limited Partner [Line Items]                        
Total Quarterly Distribution Per Limited Partner Unit $ 0.910                      
Total Quarterly Distribution Per Limited Partner Unit, Annualized $ 3.64                      
Total Cash Distribution, including general partner interest and IDRs (in thousands) $ 39,533                      
General Partner                        
Distribution Made to Limited Partner [Line Items]                        
General partner's distributions                   $ 986 $ 1,711 $ 1,553
Less: General partner's IDRs                   17,632 31,781 24,224
Total general partner's distributions                   18,618 33,492 25,777
Limited Partner                        
Distribution Made to Limited Partner [Line Items]                        
Limited partners' distribution                   $ 127,070 $ 83,873 $ 76,113