Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Net income (loss)	$ (465,015)	$ (120,176)
Net income (loss)	(465,015)	(120,176)
Adjustments to net income (loss) to reconcile to net cash provided by operating activities:
Net change in fair value of unsettled derivatives	(388,875)	181,622
Depreciation, depletion and amortization	176,157	151,422
Impairment of properties and equipment	881,074	7,875
Accretion of asset retirement obligations	2,620	1,584
Non-cash stock-based compensation	5,672	4,683
(Gain) loss on sale of properties and equipment	(179)	(369)
Amortization of debt discount and issuance costs	3,640	3,349
Deferred income taxes	(6,331)	(37,487)
Other	1,011	21
Changes in assets and liabilities	56,507	(35,424)
Net cash from operating activities	266,281	157,100
Cash flows from investing activities:
Capital expenditures for development of crude oil and natural gas properties	(190,768)	(242,187)
Capital expenditures for other properties and equipment	(455)	(4,826)
Acquisition of crude oil and natural gas properties, including settlement adjustments	(139,812)	0
Proceeds from sale of properties and equipment	793	102
Proceeds from Divestiture of Businesses	62	0
Net cash from investing activities	(330,180)	(246,911)
Cash flows from financing activities:
Proceeds from revolving credit facility	917,000	432,000
Repayment of revolving credit facility	(304,000)	(340,500)
Payments of Debt Issuance Costs	4,666	0
Proceeds from (Repurchase of) Equity	(23,819)	0
Payments for Repurchase of Common Stock	(7,693)	(1,460)
Early Repayment of Senior Debt	452,153	0
Finance Lease, Principal Payments	(489)	(494)
Other	0	(21)
Net cash from financing activities	124,180	89,525
Net change in cash, cash equivalents, and restricted cash	60,281	(286)
Cash, cash equivalents and restricted cash, beginning of period	963	9,399
Cash, cash equivalents and restricted cash, end of period	61,244	9,113
Cash payments (receipts) for:
Interest, net of capitalized interest	16,915	12,602
Income taxes	(204)	0
Non-cash investing and financing activities:
Change in accounts payable related to purchases of properties and equipment	70,026	39,694
Change in asset retirement obligation, with a corresponding change to crude oil and natural gas properties, net of disposals	$ 42,126	$ 2,794