CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS — UNAUDITED - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income (loss)	$ 191,329	$ (210,860)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Unrealized loss (gain) on derivatives	86,227	(3,762)
Depletion, depreciation and amortization	166,307	184,057
Accretion of asset retirement obligations	1,011	971
Stock-based compensation expense	2,650	7,080
Deferred income tax provision (benefit)	8,189	(69,866)
Amortization of debt issuance cost	1,655	1,399
Net loss on asset sales and impairment	0	2,632
Changes in operating assets and liabilities
Accounts receivable	(78,900)	46,628
Lease and well equipment inventory	(437)	(868)
Prepaid expenses and other current assets	(4,483)	(1,610)
Other long-term assets	91	1,806
Accounts payable, accrued liabilities and other current liabilities	34,345	(52,351)
Royalties payable	16,207	(24,198)
Advances from joint interest owners	2,017	5,094
Other long-term liabilities	1,387	232
Net cash provided by operating activities	427,595	210,385
Investing activities
Drilling, completion and equipping capital expenditures	(210,725)	(283,362)
Acquisition of oil and natural gas properties	(15,356)	(51,736)
Midstream capital expenditures	(25,092)	(123,338)
Expenditures for other property and equipment	(245)	(1,381)
Proceeds from sale of assets	296	1,056
Net cash used in investing activities	(251,122)	(458,761)
Financing activities
Repayments of borrowings under Credit Agreement	(240,000)	0
Borrowings under Credit Agreement	40,000	130,000
Repayments of borrowings under San Mateo Credit Facility	(34,000)	0
Borrowings under San Mateo Credit Facility	52,500	32,000
Cost to amend credit facilities	(830)	(660)
Dividends paid	(5,826)	0
Contributions related to formation of San Mateo	31,626	14,700
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	0	67,172
Distributions to non-controlling interest owners of less-than-wholly-owned subsidiaries	(28,910)	(22,050)
Taxes paid related to net share settlement of stock-based compensation	(2,884)	(1,493)
Other	(324)	7,087
Net cash (used in) provided by financing activities	(188,648)	226,756
Decrease in cash and restricted cash	(12,175)	(21,620)
Cash and restricted cash at beginning of period	91,383	65,128
Cash and restricted cash at end of period	$ 79,208	$ 43,508