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Property, Plant and Equipment Narrative - (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 USD ($) entity | Mar. 31, 2020 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Well Costs |  | $ 178,433 |  | $ 217,326 | $ 227,126 | $ 207,855
Exploratory well costs capitalized more than one year |  | 153,800 |  |  |  |
Impairment of oil and gas Properties |  | 967,530 |  |  |  |
Athabasca Oil Corporation | Canadian Subsidiary |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Cost of acquired assets, carried interest |  |  | $ 168,000 |  |  |
Malaysia Subsidiaries |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of businesses divested | entity | 2 |  |  |  |  |
Cash received from divestiture | $ 2,000,000 |  |  |  |  |
Gain (loss) on disposition of business | 960,000 |  |  |  |  |
Contingent bonus payment | $ 100,000 |  |  |  |  |
Brunei |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 24,200 |  |  |  |
Vietnam |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 86,000 |  |  |  |
Gulf of Mexico |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 16,400 |  |  |  |
United States |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 27,300 |  |  |  |
Impairment of oil and gas Properties |  | $ 927,821 |  |  |  |
Kaybob Duvernay Lands, Alberta | Canadian Subsidiary |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Interest in assets acquired |  |  | 70.00% |  |  |
Placid Montney Lands, Alberta | Canadian Subsidiary |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Interest in assets acquired |  |  | 30.00% |  |  |

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