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Fair Value Measurements - Significant Unobservable Inputs - Guarantees (Details) - Gulf Properties - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2016
Significant Unobservable Inputs
Hazard rate	3.71%
Fair Value Measurements Level 3
Significant Unobservable Inputs
Estimated future payments for plugging and abandonment		$ 372.0

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- Definition

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

+ References

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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