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Property, Plant and Equipment (Additional Information) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Oil and gas proved properties |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest | $ 48.9 | $ 38.1
Non-oil and natural gas equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest | 4.3 | 4.3
Building and structures |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative capitalized interest | $ 20.4 | $ 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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- Details
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- Details
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