Consolidated statements of cash flows - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended
	Mar. 21, 2017	Sep. 30, 2017	Sep. 30, 2018
Cash flows from operating activities
Net (loss) income		$ (17,433)	$ (45,503)
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Non-cash reorganization items		0	0
Depreciation, depletion and amortization		66,432	63,765
Derivative losses (gains)		4,089	72,464
Loss (gain) on sale of assets		876	2,599
Other		1,300	4,376
Change in assets and liabilities
Accounts receivable		(16,082)	(6,743)
Inventories		2,683	(1,415)
Prepaid expenses and other assets		2,560	322
Accounts payable and accrued liabilities		(13,369)	(12,383)
Revenue distribution payable		4,549	10,895
Deferred compensation		2,565	7,890
Net cash provided by operating activities		38,170	96,267
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties		(114,358)	(252,731)
Proceeds from asset dispositions		7,791	36,335
(Payments) proceeds from derivative instruments, net		15,143	(16,642)
Cash in escrow		42	0
Net cash used in investing activities		(91,382)	(233,038)
Cash flows from financing activities
Proceeds from long-term debt		33,000	116,000
Repayment of long-term debt		(1,154)	(243,554)
Proceeds from Senior Notes		0	300,000
Proceeds from rights offering, net		0	0
Principal payments under capital lease obligations		(1,362)	(2,003)
Payment of debt issuance costs and other financing fees		0	(7,572)
Treasury stock purchased		0	(4,872)
Net cash provided by (used in) financing activities		30,484	157,999
Net increase (decrease) in cash, cash equivalents, and restricted cash		(22,728)	21,228
Cash, cash equivalents, and restricted cash at beginning of period		45,123	27,732
Cash, cash equivalents, and restricted cash at end of period	$ 45,123	22,395	$ 48,960
Predecessor
Cash flows from operating activities
Net (loss) income	1,041,959
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Non-cash reorganization items	(1,012,090)
Depreciation, depletion and amortization	24,915
Derivative losses (gains)	(48,006)
Loss (gain) on sale of assets	(206)
Other	645
Change in assets and liabilities
Accounts receivable	198
Inventories	466
Prepaid expenses and other assets	(497)
Accounts payable and accrued liabilities	8,733
Revenue distribution payable	(1,875)
Deferred compensation	143
Net cash provided by operating activities	14,385
Cash flows from investing activities
Expenditures for property, plant, and equipment and oil and natural gas properties	(31,179)
Proceeds from asset dispositions	1,884
(Payments) proceeds from derivative instruments, net	1,285
Cash in escrow	0
Net cash used in investing activities	(28,010)
Cash flows from financing activities
Proceeds from long-term debt	270,000
Repayment of long-term debt	(444,785)
Proceeds from Senior Notes	0
Proceeds from rights offering, net	50,031
Principal payments under capital lease obligations	(568)
Payment of debt issuance costs and other financing fees	0
Treasury stock purchased	(2,410)
Net cash provided by (used in) financing activities	(127,732)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(141,357)
Cash, cash equivalents, and restricted cash at beginning of period	186,480	$ 45,123
Cash, cash equivalents, and restricted cash at end of period	$ 45,123