Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement of Cash Flows [Abstract]
Net (loss) income	$ (476,967)	$ 89,340
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Unrealized loss on derivatives	9,271	29,715
Depletion, depreciation and amortization	272,082	249,497
Accretion of asset retirement obligations	1,449	1,354
Full-cost ceiling impairment	575,164	0
Stock-based compensation expense	10,449	13,740
Deferred income tax (benefit) provision	(43,369)	25,335
Amortization of debt issuance cost	2,114	1,814
Net loss on asset sales and impairment	2,632	807
Changes in operating assets and liabilities
Accounts receivable	52,060	(37,341)
Lease and well equipment inventory	(632)	2,307
Prepaid expenses and other current assets	(411)	(5,099)
Other long-term assets	1,784	(291)
Accounts payable, accrued liabilities and other current liabilities	(61,452)	(15,540)
Royalties payable	(16,870)	(586)
Advances from joint interest owners	(7,125)	(3,159)
Other long-term liabilities	(220)	1,234
Net cash provided by operating activities	319,959	353,127
Investing activities
Oil and natural gas properties capital expenditures	(465,991)	(536,017)
Midstream capital expenditures	(197,942)	(120,792)
Expenditures for other property and equipment	(1,796)	(3,911)
Proceeds from sale of assets	4,574	21,671
Net cash used in investing activities	(661,155)	(639,049)
Repayments of Lines of Credit	0	(10,000)
Financing activities
Borrowings under Credit Agreement	220,000	185,000
Borrowings under San Mateo Credit Facility	38,400	40,000
Cost to amend credit facilities	(660)	(613)
Proceeds from stock options exercised	45	3,300
Contributions related to formation of San Mateo I	14,700	14,700
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	99,022	42,330
Distributions to non-controlling interest owners of less-than-wholly-owned subsidiaries	(32,830)	(27,685)
Taxes paid related to net share settlement of stock-based compensation	(1,556)	(3,665)
Other	6,850	(623)
Net cash provided by financing activities	343,971	242,744
Increase (decrease) in cash and restricted cash	2,775	(43,178)
Cash and restricted cash at beginning of period	65,128	83,984
Cash and restricted cash at end of period	$ 67,903	$ 40,806