CONSOLIDATED STATEMENT OF EQUITY - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Noncontrolling interests	Common Units	Subordinated Units	Partners' equity — common units	Partners' equity — subordinated units	Series B Preferred Units	Series B Preferred Units Partners' equity — common units
Beginning balance (in shares) at Dec. 31, 2017			103,456	95,388
Beginning balance at Dec. 31, 2017	$ 768,121	$ 867			$ 603,116	$ 164,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series A redeemable preferred units (in shares)			736	964
Conversion of Series A redeemable preferred units	24,248				10,498	13,750
Repurchases of common and subordinated units (in shares)			(486)	(23)
Repurchases of common and subordinated units	(9,071)				(8,729)	(342)
Issuance of common units, net of offering costs (in shares)			517
Issuance of common units, net of offering costs	9,067				9,067
Restricted units granted, net of forfeitures, units			1,271
Equity–based compensation	26,815				23,569	3,246
Distributions	(105,727)	(114)			(65,592)	(40,021)
Charges to partners' equity for accrued distribution equivalent rights	(1,304)				(1,304)
Distributions on preferred units	(25)				(13)	(12)	$ (10,500)	$ (10,500)
Net income (loss)	70,647	(22)			52,390	18,279
Ending balance (in shares) at Jun. 30, 2018			105,494	96,329
Ending balance at Jun. 30, 2018	$ 772,271	$ 731			$ 612,502	$ 159,038