CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss		$ (98,292)	$ 42,234	$ (599,439)	$ (84,946)
Adjustments to reconcile net loss to net cash provided by operating activities:
Net gain on divestiture activity		0	0	(91)	(323)
Depletion, depreciation, amortization, and asset retirement obligation liability accretion		181,708	211,125	596,053	595,201
Impairment		8,750	6,337	1,007,263	25,092
Stock-based compensation expense				15,437	18,758
Net derivative gain		63,871	(100,889)	(314,269)	(3,463)
Derivative settlement gain				286,270	23,843
Amortization of debt discount and deferred financing costs				13,084	11,554
Gain on extinguishment of debt		(25,070)	0	(264,546)	0
Deferred income taxes		(22,796)	19,617	(159,064)	(13,620)
Other, net				(6,203)	(2,291)
Net change in working capital				(40,411)	11,781
Net cash provided by operating activities				534,084	581,586
Cash flows from investing activities:
Net proceeds from the sale of oil and gas properties (1)	[1]			92	12,520
Capital expenditures				(419,777)	(788,642)
Acquisition of proved and unproved oil and gas properties				(7,075)	(2,581)
Net cash used in investing activities				(426,760)	(778,703)
Cash flows from financing activities:
Proceeds from revolving credit facility				1,165,500	1,124,500
Repayment of revolving credit facility				(1,110,000)	(995,500)
Debt issuance costs related to 10.0% Senior Secured Notes due 2025				(12,886)	0
Cash paid to repurchase Senior Notes				(94,262)	0
Repayment of 1.50% Senior Convertible Notes due 2021				(53,508)	0
Net proceeds from sale of common stock				947	1,959
Dividends paid				(1,130)	(5,612)
Other, net				(1,985)	(2,684)
Net cash provided by (used in) financing activities				(107,324)	122,663
Net change in cash, cash equivalents, and restricted cash				0	(74,454)
Cash, cash equivalents, and restricted cash at beginning of period				10	77,965
Cash, cash equivalents, and restricted cash at end of period		10	3,511	10	3,511
Supplemental Cash Flow Information - Operating activities:
Cash paid for interest, net of capitalized interest				(122,174)	(113,122)
Supplemental Cash Flow Information - Investing activities:
Increase (decrease) in capital expenditure accruals and other				(17,405)	34,878
Non-cash investing and financing activities
Non-cash investing and financing activities (2)(3)	[2],[3]
Cash and cash equivalents		10	10	10	10
Restricted cash (1)	[1]	$ 0	$ 3,501	$ 0	$ 3,501

[1] (1)    As of September 30, 2019, a portion of net proceeds from the sale of oil and gas properties was restricted for future property acquisitions.

[2] (2)    Please refer to Note 3 - Divestitures, Assets Held for Sale, and Acquisitions for discussion of the carrying value of properties exchanged during the nine months ended September 30, 2020, and 2019, respectively.

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