Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss	$ (186,186)	$ (29,058)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	59,184	64,120
Stock-based compensation	(2,001)	1,294
Deferred taxes	(931)	(6,983)
(Gain) loss on derivative financial instruments	(70,373)	5,177
Settlements of derivative financial instruments	66,761	(3,858)
Non-cash reorganization items	3,072	0
Impairment of oil and gas properties	199,908	0
Loss (gain) on disposal of property and equipment	83	(17)
Loss on sale of oil and gas properties	1,254	33,530
Non-cash interest expense	2,002	1,822
Change in fair value of warrants	(363)	(594)
Changes in operating assets and liabilities:
Accounts receivable	(5,413)	(8,330)
Prepaid expenses and other assets	(2,004)	(1,102)
Accounts payable and accrued expenses	17,738	(3,128)
Net cash provided by operating activities	82,731	52,873
Cash flows from investing activities
Acquisition of oil and gas properties	(2,186)	(5,239)
Development of oil and gas properties	(97,973)	(119,273)
Proceeds from sale of oil and gas properties	11,913	11,470
Purchases of other property and equipment	(1,014)	(3,527)
Net cash used in investing activities	(89,260)	(116,569)
Cash flows from financing activities
Proceeds from borrowings	48,157	114,000
Payments on borrowings	(8,154)	(52,218)
Net cash provided by financing activities	40,003	61,782
Net increase (decrease) in cash and cash equivalents	33,474	(1,914)
Cash and cash equivalents, beginning of the period	3,137	5,355
Cash and cash equivalents, end of the period	36,611	3,441
Supplemental information:
Cash paid for interest	23,831	28,125
Non-cash investing and financing activities:
Undeclared cumulative dividends on preferred stock	3,671	0
Change in asset retirement obligation	272	(292)
Change in liabilities for capital expenditures	$ (37,269)	$ 9,098