UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (54,351)	$ (408,535)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	14,736	23,179
Impairment expense	0	455,031
(Gain) loss on derivative instruments	98,443	(84,494)
Cash settlements (paid) received on expired derivative instruments	(28,432)	39,471
Cash settlements (paid) received on terminated derivative instruments	0	17,977
Bad debt expense	94	252
Amortization and write-off of deferred financing costs	360	2,999
Gain on extinguishment of debt	(5,516)	0
Accretion of asset retirement obligations	3,253	3,052
Share-based compensation (see Note 10)	730	(632)
Settlement of asset retirement obligations	(162)	0
Changes in operating assets and liabilities:
Accounts receivable	(8,851)	5,762
Prepaid expenses and other assets	3,002	659
Payables and accrued liabilities	13,505	(11,345)
Other	(408)	(387)
Net cash provided by operating activities	36,403	42,989
Cash flows from investing activities:
Additions to oil and gas properties	(11,528)	(26,123)
Additions to other property and equipment	(451)	(719)
Other	404	0
Net cash used in investing activities	(11,575)	(26,842)
Cash flows from financing activities:
Advances on revolving credit facility	0	25,000
Payments on revolving credit facility	(20,000)	(30,000)
Proceeds from the paycheck protection program	0	5,516
Deferred financing costs	(25)	0
Dividends to stockholders	0	(3,786)
Shares withheld for taxes	(17)	(35)
Other	0	35
Net cash used in financing activities	(20,042)	(3,270)
Net change in cash, cash equivalents and restricted cash	4,786	12,877
Cash, cash equivalents and restricted cash, beginning of period	10,364	325
Cash, cash equivalents and restricted cash, end of period	$ 15,150	$ 13,202