Condensed Consolidated Statements of Changes in Partners' Capital (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Limited Partner [Member]	Preferred Partner [Member]	General Partner [Member]
Balance at Dec. 31, 2017	$ 4,684	$ 454,358	$ 253,923	$ (703,597)
Net income (loss)	8,635	(10,655)	18,836	454
Equity-based incentive compensation	1,352	1,325		27
Distributions	(34,992)	(15,277)	(18,836)	(879)
Capital contributions related to sale of terminal assets to Ergon	72,967			72,967
Proceeds from sale of common units pursuant to the Employee Unit Purchase Plan	208	208
Capital contributions	183			183
Balance at Sep. 30, 2018	53,037	429,959	253,923	(630,845)
Balance at Jun. 30, 2018	(13,365)	436,416	253,923	(703,704)
Net income (loss)	2,408	(3,910)	6,279	39
Equity-based incentive compensation	665	656		9
Distributions	(9,754)	(3,319)	(6,279)	(156)
Capital contributions related to sale of terminal assets to Ergon	72,967			72,967
Proceeds from sale of common units pursuant to the Employee Unit Purchase Plan	116	116
Balance at Sep. 30, 2018	53,037	429,959	253,923	(630,845)
Balance at Dec. 31, 2018	(6,896)	370,972	253,923	(631,791)
Net income (loss)	14,072	(4,983)	18,836	219
Equity-based incentive compensation	652	637		15
Distributions	(25,905)	(6,658)	(18,836)	(411)
Proceeds from sale of common units pursuant to the Employee Unit Purchase Plan	176	176
Balance at Sep. 30, 2019	(17,901)	360,144	253,923	(631,968)
Balance at Jun. 30, 2019	(17,168)	360,861	253,923	(631,952)
Net income (loss)	6,959	574	6,278	107
Equity-based incentive compensation	289	284		5
Distributions	(8,084)	(1,678)	(6,278)	(128)
Proceeds from sale of common units pursuant to the Employee Unit Purchase Plan	103	103
Balance at Sep. 30, 2019	$ (17,901)	$ 360,144	$ 253,923	$ (631,968)