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Equity - Net income applicable to partners (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]      
Net income attributable to partners $ 96,749 $ 90,182 $ 69,409
General partner's IDRs (31,781) (24,224) (17,389)
Net income available to partners $ 64,968 $ 65,958 $ 52,020
General partner's ownership interest 2.00% 2.00% 2.00%
General partner's allocated interest in net income $ 1,299 $ 1,319 $ 1,040
General partner's IDRs 31,781 24,224 17,389
Total general partner's interest in net income $ 33,080 $ 25,543 $ 18,429