Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement of Cash Flows [Abstract]
Increase (Decrease) in Restricted Cash	$ 0	$ 8,001
Net income (loss)	(686,847)	(51,628)
Net income (loss)	(686,847)	(51,628)
Adjustments to net income (loss) to reconcile to net cash provided by operating activities:
Net change in fair value of unsettled derivatives	(153,294)	121,080
Depreciation, depletion and amortization	325,648	319,945
Impairment of properties and equipment	881,106	36,854
Accretion of asset retirement obligations	4,978	3,147
Non-cash stock-based compensation	12,036	12,258
(Gain) loss on sale of properties and equipment	(353)	(34,273)
Amortization of debt discount and issuance costs	8,941	6,731
Deferred income taxes	(2,430)	(14,975)
Other	1,657	394
Changes in assets and liabilities	(22,180)	17,950
Net cash from operating activities	369,262	417,483
Cash flows from investing activities:
Capital expenditures for development of crude oil and natural gas properties	(387,930)	(518,038)
Capital expenditures for other properties and equipment	(1,935)	(10,453)
Acquisition of crude oil and natural gas properties, including settlement adjustments	(139,812)	(4,146)
Proceeds from sale of properties and equipment	1,384	1,154
Proceeds from Divestiture of Businesses	62	199,430
Net cash from investing activities	(528,231)	(324,052)
Cash flows from financing activities:
Proceeds from revolving credit facility	1,318,000	890,000
Repayment of revolving credit facility	(669,000)	(892,500)
Payments of Debt Issuance Costs	4,666	36
Proceeds from (Repurchase of) Equity	(23,819)	(94,113)
Payments for Repurchase of Common Stock	(8,180)	(3,717)
Early Repayment of Senior Debt	452,153	0
Finance Lease, Principal Payments	(985)	(988)
Other	0	(2)
Net cash from financing activities	159,197	(101,356)
Net change in cash, cash equivalents, and restricted cash	228	(7,925)
Cash, cash equivalents and restricted cash, beginning of period	963	9,399
Cash, cash equivalents and restricted cash, end of period	1,191	1,474
Cash payments (receipts) for:
Interest, net of capitalized interest	39,168	29,034
Income taxes	(204)	200
Non-cash investing and financing activities:
Change in accounts payable related to purchases of properties and equipment	(7,223)	41,273
Change in asset retirement obligation, with a corresponding change to crude oil and natural gas properties, net of disposals	$ 44,082	$ (1,139)