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Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Apr. 01, 2017
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Total capitalized exploratory well costs |  |  | $ 227,126 | $ 155,652 |  | $ 155,103 |  | $ 207,855 |
Capitalized well costs charged to expense |  |  | 13,145 | 0 |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 149,100 |  |  |  |  |  |
Proceeds from sales of property, plant and equipment | [1] |  |  | 260 |  |  |  |  |
Gain (loss) on sale of assets |  |  | 12 | (339) | [1] |  |  |  |
MP Gulf Of Mexico LLC [Member] | Petrobas America Inc [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling ownership interest |  |  |  |  |  |  |  | 20.00% |
Athabasca Oil Corporation [Member] | Canadian Subsidiary [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Cost of acquired assets, carried interest |  |  |  |  |  |  | $ 168,000 |  |
Carried interest paid |  |  | 124,000 |  |  |  |  |  |
Montney Natural Gas Fields [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  | $ 414,100 |  |  |  |  |  |  |
Deferred gain on sale of property |  |  | 116,000 |  |  |  |  |  |
Gain (loss) on sale of assets |  | $ 187,000 |  | $ 1,900 |  |  |  |  |
Brunei [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 57,000 |  |  |  |  |  |
Vietnam [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 64,900 |  |  |  |  |  |
United States [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | $ 27,300 |  |  |  |  |  |
Kaybob Duvernay Lands, Alberta [Member] | Canadian Subsidiary [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  |  | 70.00% |  |
Placid Montney Lands, Alberta [Member] | Canadian Subsidiary [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% |  |  |  |  |  | 6.67%
Unitization and Unit Operating Agreement [Member] | Kakap Field Block K Malaysia [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Redetermination expense |  |  |  |  |  |  | $ 39,100 |  |
Redetermination expense, net of tax |  |  |  |  |  |  | $ 24,100 |  |
Redetermination liability |  |  | $ 17,300 |  |  |  |  |  |
Unitization Framework Agreement [Member] | Kakap Field Block K Malaysia [Member] |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |
Redetermination expense |  |  |  |  |  | $ 15,000 |  |  |
[1] | Reclassified to conform to current presentation (see Note A).

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