Supplemental Oil And Gas Disclosures (Results Of Operations For Producing Activities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Oil and Gas Disclosures [Abstract]
Revenues	$ 723,566	$ 633,792	$ 557,003
Production costs	(165,315)	(162,822)	(131,389)
Depreciation, depletion, amortization, and impairment	(347,220)	(222,672)	(492,475)
Results of operations, income before income taxes	211,031	248,298	(66,861)
Income tax (expense) benefit	(82,028)	(96,091)	27,533
Results of operations for producing activities (excluding corporate overhead and financing costs)	$ 129,003	$ 152,207	$ (39,328)

Results of operations oil and gas income before income taxes.

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Results of operations oil and gas income tax expense.

+ References

No definition available.

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

+ References

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- Definition

The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 26

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 23

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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Total revenues from oil and gas producing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 23

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447

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