CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 76,112,000	$ 9,017,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	23,182,000	27,833,000
Impairment of oil and natural gas properties	51,031,000	0
Accretion of asset retirement obligations	272,000	277,000
Amortization of deferred charges	260,000	257,000
(Gain) loss on commodity derivative instruments	(90,011,000)	41,183,000
Net cash (paid) received on settlement of commodity derivative instruments	8,954,000	1,743,000
Equity-based compensation	(2,894,000)	9,223,000
Exploratory dry hole expense	0	4,000
Changes in operating assets and liabilities:
Accounts receivable	19,693,000	9,740,000
Prepaid expenses and other current assets	(827,000)	(541,000)
Accounts payable, accrued liabilities, and other	(14,269,000)	(8,522,000)
Settlement of asset retirement obligations	(53,000)	(40,000)
NET CASH PROVIDED BY OPERATING ACTIVITIES	71,450,000	90,174,000
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions of oil and natural gas properties	(28,000)	(19,946,000)
Additions to oil and natural gas properties	(3,548,000)	(31,633,000)
Additions to oil and natural gas properties leasehold costs	0	(234,000)
Purchases of other property and equipment	(2,000)	(2,036,000)
Proceeds from the sale of oil and natural gas properties	1,266,000	2,000
Proceeds from farmouts of oil and natural gas properties	3,703,000	29,468,000
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,391,000	(24,379,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common units, net of offering costs	0	(43,000)
Borrowings under credit facility	67,000,000	98,000,000
Repayments under credit facility	(73,000,000)	(73,000,000)
NET CASH USED IN FINANCING ACTIVITIES	(77,920,000)	(66,962,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(5,079,000)	(1,167,000)
CASH AND CASH EQUIVALENTS – beginning of the period	8,119,000	5,414,000
CASH AND CASH EQUIVALENTS – end of the period	3,040,000	4,247,000
SUPPLEMENTAL DISCLOSURE
Interest paid	4,173,000	5,197,000
Common and Subordinated Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	(61,641,000)	(75,917,000)
Repurchases of common units	(5,029,000)	(10,752,000)
Series B cumulative convertible preferred units on an as-converted basis | Preferred Units
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to unitholders	$ (5,250,000)	$ (5,250,000)