Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Exploration and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Details)

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Supplemental Information on Oil and Gas Exploration and Production Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows $ 10,451,179 $ 14,483,197 $ 11,202,692
Future development and abandonment costs (2,058,374) (2,437,853) (3,005,217)
Future production costs (4,512,940) (5,067,554) (2,152,821)
Future production taxes (332,525) (455,840) (289,944)
Future income taxes 0 (943,293) (573,965)
Future net cash flows 3,547,340 5,578,657 5,180,745
10% discount to reflect timing of cash flows (1,843,753) (2,595,932) (2,537,181)
Standardized measure of discounted future net cash flows 1,703,587 2,982,725 2,643,564
Investment in Grizzly Oil Sands ULC      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Future cash flows 0 0 0
Future development and abandonment costs 0 0 0
Future production costs 0 0 0
Future production taxes 0 0 0
Future income taxes 0 0 0
Future net cash flows 0 0 0
10% discount to reflect timing of cash flows
Standardized measure of discounted future net cash flows $ 0 $ 0 $ 0