UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (19,328)	$ (367,199)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	7,347	15,556
Impairment expense	0	455,031
(Gain) loss on derivative instruments	34,526	(104,096)
Cash settlements (paid) received on expired derivative instruments	(11,100)	12,522
Bad debt expense	3	110
Amortization of deferred financing costs	139	309
Accretion of asset retirement obligations	1,615	1,513
Share-based compensation (see Note 11)	(204)	(1,112)
Settlement of asset retirement obligations	(162)	0
Changes in operating assets and liabilities:
Accounts receivable	(4,525)	8,381
Prepaid expenses and other assets	2,574	(349)
Payables and accrued liabilities	4,849	(7,399)
Other	(176)	(178)
Net cash provided by operating activities	15,558	13,089
Cash flows from investing activities:
Additions to oil and gas properties	(3,788)	(12,416)
Additions to other property and equipment	(328)	(304)
Net cash provided by (used in) investing activities	(4,116)	(12,720)
Cash flows from financing activities:
Advances on revolving credit facilities	0	25,000
Payments on revolving credit facilities	(5,000)	(20,000)
Dividends to stockholders	0	(3,786)
Restricted shares returned to plan and retired	(5)	(14)
Net cash provided by (used in) financing activities	(5,005)	1,200
Net change in cash, cash equivalents and restricted cash	6,437	1,569
Cash, cash equivalents and restricted cash, beginning of period	10,364	325
Cash, cash equivalents and restricted cash, end of period	$ 16,801	$ 1,894