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Property, Plant and Equipment Narrative - (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Well Costs |  | $ 245,017 | $ 185,596 |  |  | $ 207,855 | $ 155,103
Exploratory well costs capitalized more than one year |  | 211,900 |  |  |  |  |
Proceeds from sales of property, plant and equipment | [1] | 16,816 | 621 |  |  |  |
Gain (loss) on sale of assets |  | 12 | (118) | [1] |  |  |
MP Gulf Of Mexico LLC | Petrobas America Inc |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Noncontrolling ownership interest |  |  |  |  |  | 20.00% |
Athabasca Oil Corporation | Canadian Subsidiary |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Cost of acquired assets, carried interest |  |  |  |  | $ 168,000 |  |
Carried interest paid |  | 126,900 |  |  |  |  |
Montney Natural Gas Fields |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  | 414,100 |  |
Gain (loss) on sale of assets |  |  | $ 3,800 |  | $ 187,000 |  |
Deferred gain on sale of property |  | 116,800 |  |  |  |  |
Brunei |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 57,200 |  |  |  |  |
Vietnam |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 66,100 |  |  |  |  |
Gulf of Mexico |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 61,300 |  |  |  |  |
United States |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  | $ 27,300 |  |  |  |  |
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% |  |
[1] | Reclassified to conform to current presentation (See Note A).

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