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Property, Plant and Equipment - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | May. 31, 2015 well | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) well
Property, Plant and Equipment |  |  |  |  |  |  |  |
Cumulative full cost ceiling limitation impairment | $ 7,300,000,000 |  | $ 7,300,000,000 |  |  |  | $ 3,700,000,000 |
Full cost ceiling limitation impairment | 1,000,000,000 |  | 3,600,000,000 | $ 164,800,000 |  |  |  |
Impairment | 1,074,588,000 | $ 54,000 | 3,647,845,000 | 167,966,000 |  |  |  |
Drilling carry costs incurred |  |  | 3,600,000 |  |  |  |  |
Repsol E&P USA, Inc. |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |
Minimum net wells | well |  |  |  |  |  |  |  | 484
Net wells | well |  |  |  |  |  | 453 |  |
Drilling carry costs incurred | 3,600,000 |  |  |  |  |  |  |
Repsol E&P USA, Inc. | Potential drilling carry costs |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |
Drilling carry determination, amount per well short |  |  |  |  |  |  |  | $ 1,000,000
Total drilling carry, maximum | 31,000,000 |  | 31,000,000 |  |  |  |  | $ 75,000,000.0
Repsol E&P USA, Inc. |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |
Drilling carry received or billed |  |  |  | $ 205,600,000 |  |  |  |
Drilling Assets |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |
Impairment | 19,800,000 |  |  |  |  |  |  |
Buildings and structures |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |
Impairment | 15,400,000 |  | $ 15,400,000 |  |  |  |  |
Other Current Assets | Permian Region | Drilling Assets |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |
Assets classified as held-for-sale |  |  |  |  | $ 20,000,000 |  |  |
Loss on sale of assets | $ 3,500,000 |  |  |  |  |  |  |

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