v3.20.4

Supplemental Disclosures of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 55,210	$ 55,470	$ 50,063
Cash paid for income taxes	0	0	0
Cash paid for operating leases	2,235	1,315
Operating leases	957	14,999
Supplemental disclosures of non-cash investing and financing activities:
Accrued liabilities - oil and gas properties	5,435	28,130	98,346
Change in asset retirement obligations, net of disposals	(652)	(5,538)	10,778
Retirement of treasury stock	(669)	(1,729)	(1,535)
Properties exchanged in non-cash transactions	4,753	4,561	0
Issuance of common stock for 2018 Merger	0	0	$ 484,000
Operating right-of-use asset	$ 7,796	$ 8,145		$ 14,000

Accrued Liabilities, Oil and Gas Properties

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Fair Value of Properties Exchanged in Non-Cash Transactions

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Issuance Of Common Stock For Merger

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Treasury Stock, Retired

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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