CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Units	Subordinated units	Partners' equity — common units	Partners' equity — subordinated units	Series B cumulative convertible preferred units on an as-converted basis	Series B cumulative convertible preferred units on an as-converted basis Partners' equity — common units
Beginning balance (in shares) at Dec. 31, 2018		108,363	96,329
Beginning balance at Dec. 31, 2018	$ 904,263			$ 714,823	$ 189,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common and subordinated units (in shares)		(588)
Repurchases of common units	(10,110)			(10,110)
Issuance of common units, net of offering costs	(43)			(43)
Issuance of common units for property acquisitions (in shares)		57
Issuance of common units for property acquisitions	943			943
Restricted units granted, net of forfeitures (in shares)		1,545
Equity–based compensation	13,669			13,669
Distributions	(75,917)			(40,275)	(35,642)
Charges to partners' equity for accrued distribution equivalent rights	(1,044)			(1,044)
Distributions on preferred units						$ (5,250)	$ (5,250)
Net income (loss)	9,017			7,155	1,862
Ending balance (in shares) at Mar. 31, 2019		109,377	96,329
Ending balance at Mar. 31, 2019	835,528			679,868	155,660
Beginning balance (in shares) at Dec. 31, 2018		108,363	96,329
Beginning balance at Dec. 31, 2018	904,263			714,823	$ 189,440
Ending balance (in shares) at Dec. 31, 2019		205,960
Ending balance at Dec. 31, 2019	798,443			798,443
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common and subordinated units (in shares)		(503)
Repurchases of common units	(5,029)			(5,029)
Restricted units granted, net of forfeitures (in shares)		1,238
Equity–based compensation	1,159			1,159
Distributions	(61,641)			(61,641)
Charges to partners' equity for accrued distribution equivalent rights	(68)			(68)
Distributions on preferred units						$ (5,250)	$ (5,250)
Net income (loss)	76,112			76,112
Ending balance (in shares) at Mar. 31, 2020		206,695
Ending balance at Mar. 31, 2020	$ 803,726			$ 803,726