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, 2020	$ (66,223)	$ 312,591	$ 253,923	$ (632,737)
Net income (loss)	81,653	73,896	6,465	1,292
Equity-based incentive compensation	(77)	(80)	0	3
Repurchase of preferred units	(5,163)	0	(5,163)	0
Distributions	(8,107)	(1,700)	(6,279)	(128)
Proceeds from sale of common units pursuant to the Employee Unit Purchase Plan	48	48	0	0
Balance at Mar. 31, 2021	2,131	384,755	248,946	(631,570)
Balance at Dec. 31, 2021	7,557	390,310	248,729	(631,482)
Net income (loss)	6,642	386	6,150	106
Equity-based incentive compensation	249	245	0	4
Distributions	(8,105)	(1,827)	(6,150)	(128)
Proceeds from sale of common units pursuant to the Employee Unit Purchase Plan	77	77	0	0
Other	(489)	(489)	0	0
Balance at Mar. 31, 2022	$ 5,931	$ 388,702	$ 248,729	$ (631,500)