Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net loss	$ (151,384)	$ (45,274)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	40,929	39,486
Stock-based compensation	(1,998)	352
Deferred taxes	(931)	(11,688)
(Gain) loss on derivative financial instruments	(80,029)	26,724
Settlements of derivative financial instruments	23,998	(3,579)
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	33,046
Non-cash interest expense	1,374	1,182
Change in fair value of warrants	(363)	(694)
Changes in operating assets and liabilities:
Accounts receivable	(189)	(3,379)
Prepaid expenses and other assets	(897)	(692)
Accounts payable and accrued expenses	(1,344)	2,720
Net cash provided by operating activities	30,411	38,187
Cash flows from investing activities
Acquisition of oil and gas properties	(1,714)	(3,025)
Development of oil and gas properties	(72,824)	(67,696)
Proceeds from sale of oil and gas properties	2,837	11,953
Purchases of other property and equipment	(636)	(3,267)
Net cash used in investing activities	(72,337)	(62,035)
Cash flows from financing activities
Proceeds from borrowings	48,157	54,000
Payments on borrowings	(8,109)	(32,167)
Net cash provided by financing activities	40,048	21,833
Net decrease in cash and cash equivalents	(1,878)	(2,015)
Cash and cash equivalents, beginning of the period	3,137	5,355
Cash and cash equivalents, end of the period	1,259	3,340
Supplemental information:
Cash paid for interest	21,036	19,770
Non-cash investing and financing activities:
Change in asset retirement obligation	24	(455)
Change in liabilities for capital expenditures	$ (16,809)	$ 28,384