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The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

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

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- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 18

-Subparagraph (c)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 21, 22

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The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated.

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-Publisher SEC

-Name Industry Guide

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-Paragraph 6

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Area spaced or assigned to productive wells in which a working interest is owned.

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-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 4

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Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells.

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-Publisher SEC

-Name Industry Guide

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 19

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-SubTopic 20

-Section 25

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The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals.

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-Publisher FASB

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-Paragraph 15

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-Glossary Investing Activities

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Business Combinations And Other Acquisitions (Acquisition Of Oil And Gas Mineral Rights) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	12 Months Ended			0 Months Ended	3 Months Ended		4 Months Ended
	Dec. 31, 2011 Cana Woodford Region Of Oklahoma [Member]	Mar. 31, 2013 Utica Shale Region Of Ohio [Member] item acre	Dec. 31, 2012 Utica Shale Region Of Ohio [Member] item acre	Sep. 30, 2012 Utica Shale Region Of Ohio [Member] acre	Dec. 31, 2011 Utica Shale Region Of Ohio [Member] acre	Mar. 06, 2012 Utica Shale Region Of Ohio [Member] Lease Agreement [Member] acre	Mar. 31, 2013 Utica Shale Region Of Ohio [Member] Lease Agreement [Member]	Jun. 30, 2012 Utica Shale Region Of Ohio [Member] Lease Agreement [Member]	Jun. 30, 2012 Utica Shale Region Of Ohio [Member] Lease Agreement [Member]	Mar. 31, 2013 Utica Shale Region Of Ohio [Member] Lease Agreement [Member] Property Subject To Title Restrictions [Member] acre
Business Acquisition [Line Items]
Acquisition of mineral rights	$ 8.1
Ownership percentage		5.00%		5.00%	10.80%
Gross acreage		137,000		125,000	80,000					250
Net acreage		6,850		6,250		1,232
Cumulative investment in pro rata interest in oil and gas leases		25.1
Drilling costs		6.9	5.3
Number of wells that began production		1	2
Lease term							5 years
Lease renewal term							3 years
Lease bonus per acre							6,000
Lease revenue						$ 0.5		$ 6.9	$ 7.4
Royalty percentage							20.00%