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Equity - Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 12, 2020
May 12, 2020
Feb. 12, 2020
Nov. 12, 2019
Aug. 13, 2019
May 14, 2019
Feb. 12, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Distribution Made to Limited Partner [Line Items]                      
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)   $ 0.890 $ 0.885 $ 0.880 $ 0.850            
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)   $ 3.56 $ 3.54 $ 3.52 $ 3.40            
Total Cash Distribution, including general partner interest and IDRs   $ 30,878 $ 30,634 $ 30,379 $ 28,914 $ 27,400 $ 26,900 $ 47,558   $ 47,558  
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)               $ 0.900 $ 0.850 $ 1.790 $ 1.670
Subsequent Event                      
Distribution Made to Limited Partner [Line Items]                      
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share) $ 0.900                    
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share) $ 3.60                    
Total Cash Distribution, including general partner interest and IDRs $ 35,969