UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ (426,220)	$ (7,679)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	31,129	39,696
Impairment expense	455,031	0
(Gain) loss on derivative instruments	(70,162)	(18,897)
Cash settlements (paid) received on expired derivative instruments	53,076	2,315
Cash settlements (paid) received on terminated derivative instruments	17,977	0
Bad debt expense	470	266
Amortization and write-off of deferred financing costs	3,134	62
Accretion of asset retirement obligations	4,617	4,071
Share-based compensation (see Note 11)	(161)	4,073
Settlement of asset retirement obligations	(199)	(259)
Changes in operating assets and liabilities:
Accounts receivable	5,769	11,328
Prepaid expenses and other assets	1,080	(1,968)
Payables and accrued liabilities	(11,467)	(12,115)
Other	(476)	4,995
Net cash provided by operating activities	63,598	25,888
Cash flows from investing activities:
Cash acquired from the Merger	0	19,250
Additions to oil and gas properties	(31,234)	(63,004)
Additions to other property and equipment	(828)	788
Additions to restricted investments	0	(154)
Withdrawals of restricted investments	0	90,000
Proceeds from the sale of other property and equipment	0	31
Net cash provided by (used in) investing activities	(32,062)	46,911
Cash flows from financing activities:
Advances on revolving credit facilities	25,000	103,000
Payments on revolving credit facilities	(45,000)	(119,000)
Proceeds from the paycheck protection program	5,516	0
Deferred financing costs	(65)	(832)
Dividends to stockholders	(3,786)	(8,189)
Common stock repurchased and retired under the share repurchase program	0	(13,251)
Costs incurred in conjunction with tender offer	0	(107)
Restricted units returned to plan	(40)	(313)
Other	35	156
Net cash provided by (used in) financing activities	(18,340)	(115,095)
Net change in cash, cash equivalents and restricted cash	13,196	(42,296)
Cash, cash equivalents and restricted cash, beginning of period	325	50,029
Cash, cash equivalents and restricted cash, end of period	13,521	7,733
Midstates [Member]
Cash flows from financing activities:
Payments on revolving credit facilities	$ 0	$ (76,559)