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Fair Value Measurements - Significant Unobservable Inputs - Guarantees (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Gulf Properties | Fair Value Measurements Level 3
Significant Unobservable Inputs
Estimated future payments for plugging and abandonment	$ 372,034	$ 372,034

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- Definition

Estimated cash flows used as an input to measure fair value.

+ References

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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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