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Supplemental Information on Oil and Natural Gas Producing Activities - Standardized Measure of Discounted Future Net Cash Flows (Unaudited) (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Standardized measure of discounted future net cash flows	$ 4,017,611	[1]	$ 5,840,368	[1]	$ 5,216,337	[1]
Noncontrolling Interest
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Standardized measure of discounted future net cash flows	$ 781,600		$ 952,700		$ 932,800
[1] Includes approximately $781.6 million, $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2013, 2012 and 2011 respectively.

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- Definition

This amount is the future net cash flows less the computed discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 30

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62424-109447



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 31

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62455-109447

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