Consolidated Statements of Changes in Partners’ Capital - USD ($) $ in Thousands	Common units	Total
Partner's Deficit at Dec. 31, 2017	$ (29,308)	$ (29,308)
Partner's Deficit (in shares) at Dec. 31, 2017	14,965,134
Unit-based compensation programs	$ 738	738
Unit-based compensation programs (in shares)	(4,166)
Issuance of common units, net of offering costs	$ 2,292	2,292
Issuance of common units, net of offering costs (in shares)	210,978
Cash distributions to common unit holders	$ (6,746)	(6,746)
Distributions - Class B preferred units	(9,281)	(9,281)
Net (loss) income	1,442	1,442
Partner's Deficit at Mar. 31, 2018	$ (40,863)	(40,863)
Partner's Deficit (in shares) at Mar. 31, 2018	15,171,946
Partner's Deficit at Dec. 31, 2017	$ (29,308)	(29,308)
Partner's Deficit (in shares) at Dec. 31, 2017	14,965,134
Net (loss) income		(353)
Partner's Deficit at Jun. 30, 2018	$ (56,267)	(56,267)
Partner's Deficit (in shares) at Jun. 30, 2018	16,000,554
Partner's Deficit at Mar. 31, 2018	$ (40,863)	(40,863)
Partner's Deficit (in shares) at Mar. 31, 2018	15,171,946
Unit-based compensation programs	$ 2,047	2,047
Unit-based compensation programs (in shares)	608,394
Issuance of common units, net of offering costs	$ 2,280	2,280
Issuance of common units, net of offering costs (in shares)	220,214
Cash distributions to common unit holders	$ (6,868)	(6,868)
Distributions - Class B preferred units	(11,068)	(11,068)
Net (loss) income	(1,795)	(1,795)
Partner's Deficit at Jun. 30, 2018	$ (56,267)	(56,267)
Partner's Deficit (in shares) at Jun. 30, 2018	16,000,554
Partner's Deficit at Dec. 31, 2018	$ (64,620)	(64,620)
Partner's Deficit (in shares) at Dec. 31, 2018	16,486,239
Unit-based compensation programs	$ 815	815
Unit-based compensation programs (in shares)	978,076
Issuance of common units, net of offering costs	$ 1,355	1,355
Issuance of common units, net of offering costs (in shares)	787,750
Cash distributions to common unit holders	$ (2,471)	(2,471)
Distributions - Class B preferred units	(9,535)	(9,535)
Net (loss) income	(374)	(374)
Partner's Deficit at Mar. 31, 2019	$ (75,011)	(75,011)
Partner's Deficit (in shares) at Mar. 31, 2019	18,252,065
Partner's Deficit at Dec. 31, 2018	$ (64,620)	(64,620)
Partner's Deficit (in shares) at Dec. 31, 2018	16,486,239
Net (loss) income		3,503
Partner's Deficit at Jun. 30, 2019	$ (83,238)	(83,238)
Partner's Deficit (in shares) at Jun. 30, 2019	19,188,086
Adoption of accounting standards	$ (181)	(181)
Partner's Deficit at Mar. 31, 2019	$ (75,011)	(75,011)
Partner's Deficit (in shares) at Mar. 31, 2019	18,252,065
Units tendered by SOG employees for tax withholding	$ (218)	(218)
Units tendered by SOG employees for tax withholding (in shares)	(84,711)
Unit-based compensation programs	$ 175	175
Unit-based compensation programs (in shares)	133,463
Issuance of common units, net of offering costs	$ 2,034	2,034
Issuance of common units, net of offering costs (in shares)	887,269
Cash distributions to common unit holders	$ (2,745)	(2,745)
Distributions - Class B preferred units	(11,350)	(11,350)
Net (loss) income	3,877	3,877
Partner's Deficit at Jun. 30, 2019	$ (83,238)	$ (83,238)
Partner's Deficit (in shares) at Jun. 30, 2019	19,188,086