Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Net income (loss)	$ 49,248	$ (717,630)
Adjustments to net income (loss) to reconcile to net cash provided by operating activities:
Net change in fair value of unsettled commodity derivatives	491,830	(18,338)
Depreciation, depletion and amortization	478,617	470,152
Impairment of properties and equipment	329	882,327
Accretion of asset retirement obligations	9,185	7,398
Non-cash stock-based compensation	17,294	17,441
Loss (gain) on sale of properties and equipment	(561)	(642)
Amortization of debt discount and issuance costs	11,195	12,546
Deferred income taxes	0	(2,431)
Other	2,353	1,950
Changes in assets and liabilities	(31,670)	(3,461)
Net cash from operating activities	1,027,820	649,312
Cash flows from investing activities:
Capital expenditures for development of crude oil and natural gas properties	(428,831)	(445,505)
Capital expenditures for other properties and equipment	(363)	(1,940)
Acquisition of crude oil and natural gas properties, including settlement adjustments	0	(139,812)
Proceeds from sale of properties and equipment	4,720	1,539
Proceeds from Divestiture of Businesses	0	1,796
Net cash from investing activities	(424,474)	(583,922)
Cash flows from financing activities:
Proceeds from revolving credit facility	502,800	1,485,600
Repayment of revolving credit facility	(670,800)	(1,204,600)
Proceeds from Secured Notes Payable	0	148,500
Early Repayment of Senior Debt	0	452,153
Repayments of Convertible Debt	(200,000)	0
Payments of Debt Issuance Costs	0	6,197
Purchase of treasury shares for employee stock-based compensation tax withholding obligations	(5,836)	(8,412)
Purchase of treasury shares under stock repurchase program	(107,318)	(23,819)
Dividends paid	(23,600)	0
Finance Lease, Principal Payments	(1,293)	(1,454)
Net cash from financing activities	(506,047)	(62,535)
Net change in cash, cash equivalents, and restricted cash	97,299	2,855
Cash, cash equivalents and restricted cash, beginning of period	2,623	963
Cash, cash equivalents and restricted cash, end of period	$ 99,922	$ 3,818