CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUE
Revenue from contracts with customers	$ 93,043,000	$ 124,989,000
Gain (loss) on commodity derivative instruments	90,011,000	(41,183,000)
TOTAL REVENUE	183,054,000	83,806,000
OPERATING (INCOME) EXPENSE
Lease operating expense	3,827,000	5,292,000
Production costs and ad valorem taxes	12,376,000	14,592,000
Exploration expense	1,000	4,000
Depreciation, depletion, and amortization	23,182,000	27,833,000
Impairment of oil and natural gas properties	51,031,000	0
General and administrative	11,856,000	21,214,000
Accretion of asset retirement obligations	272,000	277,000
TOTAL OPERATING EXPENSE	102,545,000	69,212,000
INCOME (LOSS) FROM OPERATIONS	80,509,000	14,594,000
OTHER INCOME (EXPENSE)
Interest and investment income	31,000	46,000
Interest expense	(4,427,000)	(5,525,000)
Other income (expense)	(1,000)	(98,000)
TOTAL OTHER EXPENSE	(4,397,000)	(5,577,000)
NET INCOME (LOSS)	76,112,000	9,017,000
Distributions on Series B cumulative convertible preferred units	5,250,000	5,250,000
Distributions on Series B cumulative convertible preferred units	(5,250,000)	(5,250,000)
NET INCOME (LOSS) ATTRIBUTABLE TO THE GENERAL PARTNER AND COMMON AND SUBORDINATED UNITS	70,862,000	3,767,000
ALLOCATION OF NET INCOME (LOSS):
General partner interest	0	0
NET INCOME (LOSS) ATTRIBUTABLE TO THE GENERAL PARTNER AND COMMON AND SUBORDINATED UNITS	70,862,000	3,767,000
Common Units
ALLOCATION OF NET INCOME (LOSS):
Allocation of net income (loss)	$ 70,862,000	$ 1,905,000
NET INCOME (LOSS) ATTRIBUTABLE TO LIMITED PARTNERS PER COMMON AND SUBORDINATED UNIT:
Per unit (basic) (in dollars per share)	$ 0.34	$ 0.02
Weighted average units outstanding (basic) (in shares)	206,631	109,420
Per unit (diluted) (in dollars per share)	$ 0.34	$ 0.02
Weighted average units outstanding (diluted) (in shares)	206,631	110,035
Subordinated units
ALLOCATION OF NET INCOME (LOSS):
Allocation of net income (loss)	$ 0	$ 1,862,000
NET INCOME (LOSS) ATTRIBUTABLE TO LIMITED PARTNERS PER COMMON AND SUBORDINATED UNIT:
Per unit (basic) (in dollars per share)	$ 0	$ 0.02
Weighted average units outstanding (basic) (in shares)	0	96,329
Per unit (diluted) (in dollars per share)	$ 0	$ 0.02
Weighted average units outstanding (diluted) (in shares)	0	96,329
Oil and condensate sales
REVENUE
Revenue from contracts with customers	$ 52,093,000	$ 57,704,000
Natural gas and natural gas liquids sales
REVENUE
Revenue from contracts with customers	36,642,000	61,640,000
Lease bonus and other income
REVENUE
Revenue from contracts with customers	$ 4,308,000	$ 5,645,000