Anticipated Timing Of Inclusion Of Unproved Property Costs In Amortization Calculation

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- Definition

Amortization computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(c)(7)(i))

-URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 7

-Article 4

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- Definition

The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

+ References

+ Details

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- Definition

Depreciation, depletion, amortization, and accretion related to oil and gas producing activities.

+ References

No definition available.

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Oil and Natural Gas Activities--Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Depreciation, depletion, and amortization expense of oil and natural gas properties	$ 231,761	$ 179,734	$ 154,788
Average depreciation, depletion and amortization rate per equivalent unit of production (USD per unit)	21.10	18.45	16.98
Unproved property costs excluded from amortization	288,425	321,477
Incurred During Current Reporting Period [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Unproved property costs excluded from amortization	102,860
Incurred One Year Prior To Current Reporting Period [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Unproved property costs excluded from amortization	122,494
Incurred Two Years Prior To Current Reporting Period [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Unproved property costs excluded from amortization	62,092
Incurred More Than Two Years Prior To Current Reporting Period [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Unproved property costs excluded from amortization	$ 979
Minimum [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Evaluation period of oil and natural gas properties (in years)	2 years
Maximum [Member]
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Evaluation period of oil and natural gas properties (in years)	5 years