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Supplemental Information on Oil and Gas Exploration and Production Activities (Unaudited) - Capitalized Costs Related to Oil and Gas Producing Activities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Reserve Quantities [Line Items]
Proved properties	$ 8,909,069	$ 7,153,799
Unproved properties	1,686,666	2,873,037
Capitalized costs, gross	10,595,735	10,026,836
Accumulated depreciation, depletion, amortization and impairment	(7,191,957)	(4,613,293)
Net capitalized costs	3,403,778	5,413,543
Investment in Grizzly Oil Sands ULC
Reserve Quantities [Line Items]
Proved properties	64,476	67,475
Unproved properties	85,395	79,605
Capitalized costs, gross	149,871	147,080
Accumulated depreciation, depletion, amortization and impairment	(1,634)	(1,553)
Net capitalized costs	$ 148,237	$ 145,527

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Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

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Net amount of capitalized costs relating to oil and gas producing activities.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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