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Property, Plant and Equipment (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 01, 2017
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total capitalized exploratory well costs |  | $ 206,371,000 | $ 175,640,000 | $ 175,534,000 | $ 206,371,000 | $ 175,534,000 | $ 175,640,000 | $ 148,500,000 |
Capitalized well costs charged to expense |  |  |  |  | 0 | 8,360,000 |  |  |
Exploratory well costs capitalized more than one year |  | 171,600,000 |  |  | 171,600,000 |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  | 623,000 | 64,303,000 |  |  |
Gain (loss) on sale of assets |  | 220,000 |  | $ (1,333,000) | (118,000) | 130,648,000 |  |  |
Athabasca Oil Corporation [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Cost of acquired assets, cash paid |  |  |  |  |  |  |  | 206,700,000 |
Cost of acquired assets, carried interest |  |  |  |  |  |  |  | 168,000,000 |
Carried interest paid |  | 75,400,000 |  |  | 75,400,000 |  |  |  |
Canadian Subsidiary [Member] | Athabasca Oil Corporation [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Cost of acquired assets |  |  |  |  |  |  |  | 375,000,000 |
Western Canada [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment | $ 48,800,000 |  |  |  |  |  |  |  |
Asset retirement obligation settled | $ 85,900,000 |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  | 132,400,000 | 132,400,000 |  |
Eagle Ford Shale [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  |  |  | 19,600,000 |  |
Gain (loss) on sale of assets |  |  |  |  |  |  | $ 0 |  |
Montney Natural Gas Fields [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  |  |  |  | 414,100,000 |
Deferred gain on sale of property |  | 170,200,000 |  |  | $ 170,200,000 |  |  | $ 187,000,000 |
Deferred gain, period of recognition |  |  |  |  | 18 years |  |  |  |
Amortization of deferred gain |  |  |  |  | $ 3,800,000 | $ 3,400,000 |  |  |
Brunei [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 70,400,000 |  |  | 70,400,000 |  |  |  |
Vietnam [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 52,600,000 |  |  | 52,600,000 |  |  |  |
United States [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 27,800,000 |  |  | 27,800,000 |  |  |  |
Malaysia [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | $ 20,800,000 |  |  | $ 20,800,000 |  |  |  |
Kaybob Duvernay Lands, Alberta [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  |  |  | 70.00% |
Placid Montney Lands, Alberta [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  |  |  | 30.00% |
Kakap Field Block K Malaysia [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Working interest |  | 6.37% |  |  | 6.37% |  |  |  | 6.67%
Unitization and Unit Operating Agreement [Member] | Kakap Field Block K Malaysia [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Redetermination expense |  |  |  |  |  |  |  | $ 39,100,000 |
Redetermination expense, net of tax |  |  |  |  |  |  |  | $ 24,100,000 |
Redetermination liability |  | $ 17,300,000 |  |  | $ 17,300,000 |  |  |  |
Unitization Framework Agreement [Member] | Kakap Field Block K Malaysia [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Redetermination expense |  |  | 15,000,000 |  |  |  |  |  |
Redetermination expense, net of tax |  |  | $ 9,300,000 |  |  |  |  |  |
Redetermination liability |  | $ 15,000,000 |  |  | $ 15,000,000 |  |  |  |

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