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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net revenues $ 138,611 $ 137,556 $ 155,342 $ 152,483 $ 159,298 $ 164,110 $ 166,280 $ 167,921 $ 583,992 $ 657,609 $ 538,075
Operating income 29,716 34,729 32,256 29,111 31,147 32,624 34,710 27,277 125,812 125,757 88,177
Net income 21,638 30,530 24,885 19,696 21,280 23,326 25,582 19,995 96,749 90,182 69,409
Limited partners' interest in net income $ 12,802 $ 21,635 $ 16,806 $ 12,426 $ 14,215 $ 16,690 $ 19,370 $ 14,365 $ 63,669 $ 64,639 $ 50,980
Net income per limited partner unit:                      
Common (basic) (in usd per unit)                 $ 2.61 $ 2.65 $ 2.09
Common units - (diluted) (in usd per unit)                 $ 2.61 $ 2.65 $ 2.09
Common Units                      
Net income per limited partner unit:                      
Common (basic) (in usd per unit) $ 0.52 $ 0.89 $ 0.69 $ 0.51 $ 0.58 $ 0.68 $ 0.79 $ 0.59      
Common units - (diluted) (in usd per unit) $ 0.52 $ 0.89 $ 0.69 $ 0.51 $ 0.58 $ 0.68 $ 0.79 $ 0.59