CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (121,491)	$ 157,749
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation, depletion, amortization and accretion expense	116,642	105,960
Write-down of oil and natural gas properties and other well inventory		190
Amortization of deferred financing costs and original issue discount	3,142	1,466
Equity based compensation, net of amounts capitalized	2,664	1,627
Price risk management activities expense (income)	137,508	(243,217)
Net cash received (paid) on settled derivative instruments	(48,381)	36,460
Loss on extinguishment of debt	13,225
Settlement of asset retirement obligations	(10,120)	(6,302)
Gain on sale of assets	(319)
Changes in operating assets and liabilities:
Accounts receivable	(17,108)	(11,578)
Other current assets	(3,350)	18,318
Accounts payable	(10,978)	(18,547)
Other current liabilities	5,328	13,337
Other non-current assets and liabilities, net	194	54,769
Net cash provided by operating activities	66,956	110,232
Cash flows from investing activities:
Exploration, development and other capital expenditures	(64,745)	(83,588)
Cash paid for acquisitions, net of cash acquired	(8,322)	(293,095)
Proceeds from sale of oil and gas properties	330
Net cash provided by (used in) investing activities	(72,737)	(376,683)
Cash flows from financing activities:
Issuance of Senior Notes	600,500
Redemption of Senior Notes and other long-term debt	(356,803)
Proceeds from Bank Credit Facility		300,000
Repayment of Bank Credit Facility	(175,000)
Deferred financing costs	(19,387)	(1,285)
Other deferred payments	(5,575)	(7,575)
Payments of finance lease	(5,058)	(4,049)
Employee stock transactions	(2,150)	(710)
Net cash provided by (used in) financing activities	36,527	286,381
Net increase in cash, cash equivalents and restricted cash	30,746	19,930
Cash, cash equivalents and restricted cash:
Balance, beginning of period	34,233	87,022
Balance, end of period	64,979	106,952
Supplemental Non-Cash Transactions:
Capital expenditures included in accounts payable and accrued liabilities	65,755	66,712
Supplemental Cash Flow Information:
Interest paid, net of amounts capitalized	$ 13,712	$ 4,906