Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
General partner's distributions	$ 542	$ 424	$ 986	$ 832
General partner's IDRs	8,937	7,736	17,632	14,751
Total general partner's distributions	9,479	8,160	18,618	15,583
Common limited partners' distributions	26,490	20,754	48,229	40,769
Total cash distributions	$ 35,969	$ 28,914	$ 66,847	$ 56,352
Cash distributions per limited partner unit (in dollars per share)	$ 0.900	$ 0.850	$ 1.790	$ 1.670