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Area of land sold in the reporting period.

No definition available.

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Period of from end of prior lease year of the lessor's leasing arrangement, contingent rental payment is due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Period of term of the lessor's leasing arrangement, after which additional annual rental payments may be received, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Period of term of the lessor's leasing arrangement, after which the lessee has the option to terminate the lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Lessor, Operating Lease, Drilling Penalty, Amount

No definition available.

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Lessor, Operating Lease, Lease Payment, Amount

No definition available.

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Lessor, Operating Lease, Lease Payment and Drilling Penalty, Amount

No definition available.

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The number of counties in which the entity owns subsurface interests as of balance sheet date.

No definition available.

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The revenue from real estate operations recognized for cash payments received for the release of surface entry rights during the reporting period.

No definition available.

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Are of land for which the surface entry rights were released.

No definition available.

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- References

No definition available.

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Area of land held.

No definition available.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Area spaced or assigned to productive wells in which a working interest is owned.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1208
-Paragraph (a)

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Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves.

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- References

No definition available.

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Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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-Subparagraph (a)(3)
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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- References

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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-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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-Name Accounting Standards Codification
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Indicates type of revenue from product and service.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 55
-Paragraph 91
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108792157&loc=SL49130690-203046-203046

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Data Type:	srt-types:extensibleListItemType
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Name:	us-gaap_MajorPropertyClassAxis=us-gaap_DrillingRightsMember
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