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Property, Plant and Equipment (Additional Information) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Oil and natural gas proved properties
Property, Plant and Equipment
Cumulative capitalized interest	$ 45.6	$ 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	$ 19.2	$ 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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X

- Details

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- Details

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