Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 2,828	$ (14,098)
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation, depletion, amortization and accretion	44,304	29,950
Exploration expense	10,720	9,600
Stock-based compensation	860	6,001
Impairment of oil and gas properties	6,849
Net cash for plugging wells	(81)	(48)
(Gain) loss on derivative instruments	(40,131)	4,931
Net cash receipts (payments) on settled derivatives	18,236	(3,186)
Loss on sale of assets	490	2
Amortization of deferred financing costs	619	629
Amortization of debt discount	333	333
Changes in operating assets and liabilities:
Accounts receivable	19,238	25,812
Other assets	404	(188)
Accounts payable and accrued liabilities	(43,179)	(68,643)
Net cash provided by (used in) operating activities	21,490	(8,905)
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures for oil and gas properties	(46,894)	(58,530)
Capital expenditures for other property and equipment	(250)	(184)
Proceeds from sale of assets	1,073	1
Cash acquired in merger		12,894
Change in deposits and other long-term assets		(3)
Net cash used in investing activities	(46,071)	(45,822)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issuance costs	(31)	(3,102)
Repayments of long-term debt	(41)	(98)
Proceeds from revolving credit facility	20,000	65,000
Equity issuance costs		(30)
Employee tax withholding for settlement of equity compensation awards	(95)	(5,410)
Net cash provided by financing activities	19,833	56,360
Net increase (decrease) in cash and cash equivalents	(4,748)	1,633
Cash and cash equivalents at beginning of period	12,056	5,959
Cash and cash equivalents at end of period	7,308	7,592
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	23,874	24,198
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Asset retirement obligations incurred, including changes in estimate	41	16,691
Additions to oil and natural gas properties - changes in accounts payable, accrued liabilities, and accrued capital expenditures	$ 5,222	45,287
BRMR Merger consideration		$ 275,759