CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss		$ (222,995)	$ (89,252)	$ (474,264)	$ (501,147)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation, amortization, and asset retirement obligation liability accretion		204,714	180,856	371,674	414,345
Impairment		8,750	8,750	17,500	998,513
Stock-based compensation expense				9,693	11,273
Net derivative (gain) loss		370,348	167,200	715,037	(378,140)
Derivative settlement gain (loss)				(266,707)	215,965
Amortization of debt discount and deferred financing costs				9,445	8,578
(Gain) loss on extinguishment of debt		2,144	(227,281)	2,144	(239,476)
Deferred income taxes		(162)	(36,921)	(214)	(136,268)
Other, net				(13,377)	(3,918)
Net change in working capital				31,092	(57,254)
Net cash provided by operating activities				402,023	332,471
Cash flows from investing activities:
Capital expenditures				(370,177)	(310,209)
Other, net				221	92
Net cash used in investing activities				(369,956)	(310,117)
Cash flows from financing activities:
Proceeds from revolving credit facility				944,000	841,000
Repayment of revolving credit facility				(984,500)	(770,500)
Net proceeds from Senior Notes				393,583	0
Cash paid to repurchase Senior Notes				(385,296)	(81,826)
Debt issuance costs related to 10.0% Senior Secured Notes due 2025				0	(10,491)
Net proceeds from sale of common stock				1,315	947
Dividends paid				(1,178)	(1,130)
Other				(1)	(354)
Net cash used in financing activities				(32,077)	(22,354)
Net change in cash, cash equivalents, and restricted cash				(10)	0
Cash, cash equivalents, and restricted cash at beginning of period				10	10
Cash, cash equivalents, and restricted cash at end of period		$ 0	$ 10	0	10
Supplemental Cash Flow Information - Operating activities:
Cash paid for interest, net of capitalized interest				(74,864)	(82,313)
Supplemental Cash Flow Information - Investing activities:
Increase (decrease) in capital expenditure accruals and other				28,987	(28,896)
Supplemental Cash Flow Information - Investing activities:
Non-cash investing and financing activities (1)	[1]

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