CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss		$ 85,593	$ (98,292)	$ (388,671)	$ (599,439)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation, amortization, and asset retirement obligation liability accretion		202,701	181,708	574,375	596,053
Impairment		8,750	8,750	26,250	1,007,263
Stock-based compensation expense				14,191	15,437
Net derivative (gain) loss		209,146	63,871	924,183	(314,269)
Derivative settlement gain (loss)				(480,262)	286,270
Amortization of debt discount and deferred financing costs				13,350	13,084
(Gain) loss on extinguishment of debt		(5)	(25,070)	2,139	(264,546)
Deferred income taxes		(68)	(22,796)	(282)	(159,064)
Other, net				(7,301)	(6,294)
Net change in working capital				52,170	(40,411)
Net cash provided by operating activities				730,142	534,084
Cash flows from investing activities:
Net proceeds from the sale of oil and gas properties				8,835	92
Capital expenditures				(550,265)	(419,777)
Acquisition of proved and unproved oil and gas properties				(3,321)	(7,075)
Net cash used in investing activities				(544,751)	(426,760)
Cash flows from financing activities:
Proceeds from revolving credit facility				1,649,500	1,165,500
Repayment of revolving credit facility				(1,742,500)	(1,110,000)
Net proceeds from Senior Notes				392,771	0
Cash paid to repurchase Senior Notes				(450,776)	(147,770)
Debt issuance costs related to 10.0% Senior Secured Notes due 2025				0	(12,886)
Net proceeds from sale of common stock				1,315	947
Dividends paid				(1,178)	(1,130)
Other, net				(4,733)	(1,985)
Net cash used in financing activities				(155,601)	(107,324)
Net change in cash, cash equivalents, and restricted cash				29,790	0
Cash, cash equivalents, and restricted cash at beginning of period				10	10
Cash, cash equivalents, and restricted cash at end of period		$ 29,800	$ 10	29,800	10
Supplemental Cash Flow Information - Operating activities:
Cash paid for interest, net of capitalized interest				(126,228)	(122,174)
Supplemental Cash Flow Information - Investing activities:
Increase (decrease) in capital expenditure accruals and other				8,885	(17,405)
Supplemental Cash Flow Information - Investing activities:
Non-cash financing activities (1)	[1]

[1] (1)    Please refer to Note 5 - Long-Term Debt for discussion of the debt transactions completed during the nine months ended September 30, 2021, and 2020.