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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues $ 140,112 $ 142,268 $ 117,637 $ 163,401 $ 138,610 $ 137,556 $ 155,342 $ 152,483 $ 563,418 $ 583,992 $ 657,609
Operating income 45,105 51,765 47,881 35,042 29,715 34,729 32,256 29,111 179,793 125,812 125,757
Net income 40,717 46,328 44,415 27,796 21,638 30,530 24,885 19,696 159,256 96,749 90,182
Limited partners' interest in net income $ 40,717 $ 46,328 $ 34,768 $ 18,719 $ 12,804 $ 21,635 $ 16,806 $ 12,426 $ 140,532 $ 63,669 $ 64,639
Net income per limited partner unit:                      
Common - basic (in usd per unit)                 $ 4.18 $ 2.61 $ 2.65
Common - diluted (in usd per unit)                 $ 4.18 $ 2.61 $ 2.65
Common Units                      
Net income per limited partner unit:                      
Common - basic (in usd per unit) $ 0.94 $ 1.26 $ 1.18 $ 0.76 $ 0.52 $ 0.89 $ 0.69 $ 0.51      
Common - diluted (in usd per unit) $ 0.94 $ 1.26 $ 1.18 $ 0.76 $ 0.52 $ 0.89 $ 0.69 $ 0.51