Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total revenue	$ 115,417	$ 110,245
Costs and expenses:
Operating expense	64,203	62,812
General and administrative expense	13,902	14,182
Total costs and expenses	78,105	76,994
Loss on disposal of assets	(195)	(67)
Operating income	37,117	33,184
Other income (expenses):
Other income	2,615	1,169
Interest expense	(4,944)	(5,665)
Income before income taxes	34,788	28,688
Provision for income taxes	30	(7)
Income from continuing operations	34,758	28,695
Gain (loss) from discontinued operations, net	75,772	(42,175)
Net income (loss)	110,530	(13,480)
Allocation of net income (loss) for calculation of earnings per unit:
General partner interest in net income (loss)	1,751	(213)
Preferred interest in net income	24,824	25,115
Net income (loss) available to limited partners	$ 83,955	$ (38,382)
Basic and diluted net income (loss) from discontinued operations per common unit (in dollars per share)	$ 1.74	$ (0.98)
Basic and diluted net income from continuing operations per common unit (in dollars per share)	0.22	0.07
Basic and diluted net income (loss) per common unit (in dollars per share)	$ 1.96	$ (0.91)
Weighted average common units outstanding - basic and diluted (in shares)	41,484	41,104
Third Party [Member]
Revenue	$ 30,715	$ 29,171
Operating Lease, Lease Income, Total	35,065	36,630
Related Party [Member]
Revenue	20,195	18,028
Operating Lease, Lease Income, Total	29,442	26,416
Service [Member] | Third Party [Member]
Revenue	30,715	29,171
Service [Member] | Related Party [Member]
Revenue	$ 20,195	$ 18,028