UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL - USD ($) shares in Thousands, $ in Thousands	Total	Partners’ Capital	Partners’ Capital Common Units	Noncontrolling Interest	Accumulated Other Comprehensive Loss
Partners' capital, beginning balance (units) at Dec. 31, 2018			122,579
Partners' capital, beginning balance at Dec. 31, 2018	$ 1,680,534	$ 1,690,799		$ (11,204)	$ 939
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	15,947	15,954		(7)
Cash distributions to partners	(67,419)	(67,419)
Cash contributions from noncontrolling interests	610			610
Distributions to Class A Convertible Preferred unitholders	(18,020)	(18,020)
Partners' capital, ending balance (units) at Mar. 31, 2019			122,579
Partners' capital, ending balance at Mar. 31, 2019	1,611,652	1,621,314		(10,601)	939
Partners' capital, beginning balance (units) at Dec. 31, 2019			122,579
Partners' capital, beginning balance at Dec. 31, 2019	1,431,171	1,443,320		(3,718)	(8,431)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	24,893	24,909		(16)
Cash distributions to partners	(67,419)	(67,419)
Cash contributions from noncontrolling interests	1,377			1,377
Distributions to Class A Convertible Preferred unitholders	(18,684)	(18,684)
Partners' capital, ending balance (units) at Mar. 31, 2020			122,579
Partners' capital, ending balance at Mar. 31, 2020	$ 1,371,338	$ 1,382,126		$ (2,357)	$ (8,431)