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

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- Definition

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

+ References

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- Definition

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+ References

No definition available.

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