CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Series A Redeemable Preferred Units	Series B Cumulative Convertible Preferred Units	Noncontrolling Interest	Common Units	Subordinated Units	Partners Equity Common Units	Partners Equity Common Units Series A Redeemable Preferred Units	Partners Equity Common Units Series B Cumulative Convertible Preferred Units	Partners Equity Subordinated Units	Partners Equity Subordinated Units Series A Redeemable Preferred Units	Partners Equity Subordinated Units Series B Cumulative Convertible Preferred Units
Balance at the beginning of the period, units at Dec. 31, 2015					96,162	95,057
Balance at the beginning of the period at Dec. 31, 2015	$ 831,491			$ 1,144			$ 574,648			$ 255,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable preferred units, units					184	241
Conversion of redeemable preferred units	6,064						2,625			3,439
Repurchases of units, units					(1,618)	(78)
Repurchases of units	(27,436)						(27,436)
Restricted units granted, net of forfeitures, units					993	(56)
Equity-based compensation	23,845						21,022			2,823
Distributions	(176,055)			(111)			(105,817)			(70,127)
Charges to partners' equity for accrued distribution equivalent rights	(688)						(688)
Net income (loss)	20,188			(12)			27,565			(7,365)
Distributions on redeemable preferred units		$ (5,763)						$ (2,896)			$ (2,867)
Balance at the end of the period, units at Dec. 31, 2016					95,721	95,164
Balance at the end of the period at Dec. 31, 2016	671,646			1,021			489,023			181,602
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable preferred units, units					201	263
Conversion of redeemable preferred units	6,624						2,868			3,756
Repurchases of units, units					(446)	(39)
Repurchases of units	(8,185)						(7,893)			(292)
Restricted units granted, net of forfeitures, units					1,630
Equity-based compensation	39,357						39,205			152
Distributions	(194,919)			(120)			(119,963)			(74,836)
Charges to partners' equity for accrued distribution equivalent rights	(2,694)						(2,694)
Net income (loss)	157,153			(34)			101,891			55,296
Distributions on redeemable preferred units	(3,117)		$ (1,925)				(1,577)		$ (1,925)	(1,540)		$ 0
Issuance of common units for initial public offering, net of offering costs, units					2,002
Issuance of common units, net of offering costs	32,458						32,458
Issuance of units for acquisitions, units					4,348
Issuance of common units for property acquisitions	71,723						71,723
Balance at the end of the period, units at Dec. 31, 2017					103,456	95,388
Balance at the end of the period at Dec. 31, 2017	768,121			867			603,116			164,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable preferred units, units					736	964
Conversion of redeemable preferred units	24,248						10,498			13,750
Repurchases of units, units					(623)	(23)
Repurchases of units	(11,221)						(10,879)			(342)
Restricted units granted, net of forfeitures, units					1,316
Equity-based compensation	40,952						40,733			219
Distributions	(250,162)			(211)			(141,777)			(108,174)
Charges to partners' equity for accrued distribution equivalent rights	(3,698)						(3,698)
Net income (loss)	295,560			24			175,675			119,861
Distributions on redeemable preferred units	(25)		$ (21,000)				(13)		$ (21,000)	(12)
Issuance of common units for initial public offering, net of offering costs, units					2,244
Issuance of common units, net of offering costs	40,537						40,537
Issuance of units for acquisitions, units					1,234
Issuance of common units for property acquisitions	22,657						22,657
Purchase of noncontrolling interests	(1,706)			(680)			(1,026)
Balance at the end of the period, units at Dec. 31, 2018					108,363	96,329
Balance at the end of the period at Dec. 31, 2018	$ 904,263			$ 0			$ 714,823			$ 189,440