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Property, Plant and Equipment (Additional Information) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Oil and natural gas proved properties |  |
Property, Plant and Equipment |  |
Cumulative capitalized interest | $ 47.6 | $ 38.1
Non-oil and natural gas equipment |  |
Property, Plant and Equipment |  |
Cumulative capitalized interest | 4.3 | 4.3
Buildings and structures |  |
Property, Plant and Equipment |  |
Cumulative capitalized interest | $ 20.3 | $ 17.1

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- Definition Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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