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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (277,353)	$ (449,305)
Adjustments to reconcile net loss to net cash provided by operating activities
Provision for doubtful accounts	3,202	16
Depreciation, depletion and amortization	58,085	158,558
Impairment	256,399	409,574
Debt issuance costs amortization	792	558
Write off of debt issuance costs	0	142
Gain on derivative contracts	(5,765)	(1,094)
Cash received (paid) on settlement of derivative contracts	5,879	6,266
Gain on sale of assets	(100)	0
Stock-based compensation	3,012	4,254
Other	149	(187)
Changes in operating assets and liabilities increasing (decreasing) cash
Receivables	5,867	15,829
Prepaid expenses	452	(714)
Other current assets	458	(301)
Other assets and liabilities, net	1,134	(610)
Accounts payable and accrued expenses	(12,968)	(17,217)
Asset retirement obligations	(3,081)	(4,445)
Net cash provided by operating activities	36,162	121,324
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures for property, plant and equipment	(8,762)	(191,678)
Acquisitions of assets	(3,701)
Acquisitions of assets		236
Proceeds from sale of assets	37,556	1,593
Net cash provided by (used) in investing activities	25,093	(189,849)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings	59,000	211,096
Repayments of borrowings	(96,500)	(153,596)
Debt issuance costs	(160)	(911)
Reduction of financing lease liability	(1,233)	(1,374)
Cash paid for tax withholdings on vested stock awards	(64)	(367)
Net cash (used in) provided by financing activities	(38,957)	54,848
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS and RESTRICTED CASH	22,298	(13,677)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year	5,968	19,645
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of year	$ 28,266	$ 5,968

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