CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CURRENT ASSETS
Cash and cash equivalents	$ 6,653	$ 8,876
Accounts receivable	99,463	97,142
Prepaid expenses and other current assets	1,866	1,956
TOTAL CURRENT ASSETS	107,982	107,974
PROPERTY AND EQUIPMENT
Oil and natural gas properties, at cost, using the successful efforts method of accounting, includes unproved properties of $937,395 and $937,395 at March 31, 2022 and December 31, 2021, respectively	3,003,776	3,001,627
Accumulated depreciation, depletion, amortization, and impairment	(1,880,493)	(1,869,731)
Oil and natural gas properties, net	1,123,283	1,131,896
Other property and equipment, net of accumulated depreciation of $13,000 and $12,931 at March 31, 2022 and December 31, 2021, respectively	1,262	1,440
NET PROPERTY AND EQUIPMENT	1,124,545	1,133,336
DEFERRED CHARGES AND OTHER LONG-TERM ASSETS	6,042	6,611
TOTAL ASSETS	1,238,569	1,247,921
CURRENT LIABILITIES
Accounts payable	2,380	5,944
Accrued liabilities	5,960	17,589
Commodity derivative liabilities	138,028	51,544
Other current liabilities	2,070	2,063
TOTAL CURRENT LIABILITIES	148,438	77,140
LONG–TERM LIABILITIES
Credit facility	69,000	89,000
Accrued incentive compensation	682	838
Commodity derivative liabilities	4,293	2,001
Asset retirement obligations	12,702	12,561
Other long-term liabilities	5,305	2,752
TOTAL LIABILITIES	240,420	184,292
COMMITMENTS AND CONTINGENCIES (Note 7)
EQUITY
Partners' equity – general partner interest	0	0
TOTAL EQUITY	699,788	765,268
TOTAL LIABILITIES, MEZZANINE EQUITY, AND EQUITY	1,238,569	1,247,921
Series B Cumulative Convertible Preferred Units
MEZZANINE EQUITY
Partners' equity – Series B cumulative convertible preferred units, 14,711 units outstanding at March 31, 2022 and December 31, 2021, respectively	298,361	298,361
Common units
EQUITY
Partners' equity – common units, 209,392 and 208,666 units outstanding at March 31, 2022 and December 31, 2021, respectively	$ 699,788	$ 765,268