CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 60,242	$ (37,209)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization expense	24,354	21,504
Impairment expense		3,330
Stock-based compensation	104	135
Deferred income tax (benefit) expense	11,650	(4,374)
(Gain) loss on commodity derivative financial instruments	(95,863)	33,343
Net cash settlements received on commodity derivative contracts	6,689	3,796
Unrealized loss on interest rate swaps	2,302	1,681
Amortization of deferred financing fees	886	765
Write-off of deferred financing fees	1,056
Loss on disposal of proved oil and gas properties	295
Other		2
Changes in assets and liabilities:
Accounts receivable trade and other	5,913	7,538
Income tax receivable	(83)
Accounts payable trade	(1,164)	(7,666)
Accrued liabilities	(8,388)	4,031
Other assets and liabilities, net	577	(366)
Net cash provided by operating activities	8,570	26,510
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures for proved oil and gas properties	(18,238)	(53,957)
Capital expenditures for unproved oil and gas properties	(15)	(174)
Other property and equipment	(266)	(16)
Net cash used in investing activities	(18,519)	(54,147)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings		30,000
Payments of debt issuance costs	(1,025)
Principal payments on finance lease obligations	(73)	(24)
Net cash (used in) provided by financing activities	(1,098)	29,976
Net change in cash and cash equivalents	(11,047)	2,339
CASH AND CASH EQUIVALENTS
Beginning of period	12,382	1,581
Effect of exchange rates on cash	(123)	3
End of period	1,212	3,923
SUPPLEMENTAL CASH FLOW DISCLOSURES
Interest paid, net of amounts capitalized	14,175	7,909
Operating lease right-of-use assets obtain in exchange for lease liabilities	6	2,300
Finance lease right-of-use assets obtain in exchange for lease liabilities	44
NON-CASH INVESTING AND FINANCING ACTIVITIES
Accounts payable and accrued expenses for oil and gas properties	$ 30,008	$ 27,230