UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Adjustment	Noncontrolling interest	Noncontrolling interest Adjustment	Limited partners, Series A Preferred Units	Limited partners, Series A Preferred Units Adjustment	Common	Common Adjustment	General Partner	General Partner Adjustment
January 1, 2018 impact of Topic 606 day 1 adoption	$ 4,214		$ 0		$ 0		$ 4,130		$ 84
Beginning balance at Dec. 31, 2017	1,389,669	$ 1,393,883	10,813	$ 10,813	294,426	$ 294,426	1,056,510	$ 1,060,640	27,920	$ 28,004
Net income (loss)	(3,845)		85		7,125		(13,113)		2,058
Distributions to unitholders	(45,053)		0		0		(42,024)		(3,029)
Unit-based compensation	1,979		0		0		1,979		0
Tax withholdings on vested SMLP LTIP awards	(1,943)		0		0		(1,943)		0
Other	(940)		0		(810)		(130)		0
Ending balance at Mar. 31, 2018	1,344,081		10,898		300,741		1,005,409		27,033
Beginning balance at Dec. 31, 2017	1,389,669	$ 1,393,883	10,813	$ 10,813	294,426	$ 294,426	1,056,510	$ 1,060,640	27,920	$ 28,004
Net income (loss)	3,697
Ending balance at Sep. 30, 2018	1,251,015		10,981		300,741		913,913		25,380
Beginning balance at Mar. 31, 2018	1,344,081		10,898		300,741		1,005,409		27,033
Net income (loss)	(49,913)		58		7,125		(58,236)		1,140
Distributions to unitholders	(59,466)		0		(14,250)		(42,180)		(3,036)
Unit-based compensation	2,004		0		0		2,004		0
Tax withholdings on vested SMLP LTIP awards	103		0		0		103		0
Other	(1)		0		0		(1)		0
Ending balance at Jun. 30, 2018	1,236,808		10,956		293,616		907,099		25,137
Net income (loss)	57,455		25		7,125		47,026		3,279
Distributions to unitholders	(45,215)		0		0		(42,179)		(3,036)
Unit-based compensation	1,965		0		0		1,965		0
Tax withholdings on vested SMLP LTIP awards	0		0		0		0		0
Other	2		0		0		2		0
Ending balance at Sep. 30, 2018	1,251,015		$ 10,981		300,741		913,913		25,380
Beginning balance at Dec. 31, 2018	1,221,224				293,616		902,358		25,250
Net income (loss)	(36,914)				7,125		(44,051)		12
Conversion of General Partner economic interests	0				0		22,222		(22,222)
Distributions to unitholders	(45,281)				0		(42,241)		(3,040)
Unit-based compensation	2,526				0		2,526		0
Tax withholdings on vested SMLP LTIP awards	(2,522)				0		(2,522)		0
Ending balance at Mar. 31, 2019	1,139,033				300,741		838,292		0
Beginning balance at Dec. 31, 2018	1,221,224				293,616		902,358		25,250
Net income (loss)	(42,750)
Ending balance at Sep. 30, 2019	1,074,199				300,741		773,458		0
Beginning balance at Mar. 31, 2019	1,139,033				300,741		838,292		0
Net income (loss)	4,809				7,125		(2,316)		0
Distributions to unitholders	(38,025)				(14,250)		(23,775)		0
Unit-based compensation	1,393				0		1,393		0
Tax withholdings on vested SMLP LTIP awards	(95)				0		(95)		0
Ending balance at Jun. 30, 2019	1,107,115				293,616		813,499		0
Net income (loss)	(10,645)				7,125		(17,770)		0
Distributions to unitholders	(23,777)				0		(23,777)		0
Unit-based compensation	1,451				0		1,451		0
Tax withholdings on vested SMLP LTIP awards	55				0		55		0
Ending balance at Sep. 30, 2019	$ 1,074,199				$ 300,741		$ 773,458		$ 0