Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis.

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- Definition

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.

+ 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)(ii))

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

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- Definition

Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Properties

-URI http://asc.fasb.org/extlink&oid=21914647

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-Glossary Unproved Properties

-URI http://asc.fasb.org/extlink&oid=6527831

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- Definition

The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing the oil and gas.

+ References

+ Details

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- Definition

The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.

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Property and Equipment (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Breakdown of the Company's unproved and unevaluated property costs not subject to amortization
Total unproved and unevaluated	$ 264,419	$ 194,306
2013 [Member]
Breakdown of the Company's unproved and unevaluated property costs not subject to amortization
Costs incurred for Property acquisition	87,207
Exploration wells	21,494
Amount for development wells	8,120
Capitalized interest	0
Total unproved and unevaluated	116,821
2012 [Member]
Breakdown of the Company's unproved and unevaluated property costs not subject to amortization
Costs incurred for Property acquisition		62,332
Exploration wells		0
Amount for development wells		0
Capitalized interest		0
Total unproved and unevaluated		62,332
2011 [Member]
Breakdown of the Company's unproved and unevaluated property costs not subject to amortization
Costs incurred for Property acquisition			12,800
Exploration wells			0
Amount for development wells			0
Capitalized interest			91
Total unproved and unevaluated			12,891
2010 and prior [Member]
Breakdown of the Company's unproved and unevaluated property costs not subject to amortization
Costs incurred for Property acquisition				72,375
Exploration wells				0
Amount for development wells				0
Capitalized interest				0
Total unproved and unevaluated				72,375
Projects Inception to Date [Member]
Breakdown of the Company's unproved and unevaluated property costs not subject to amortization
Costs incurred for Property acquisition	234,714
Exploration wells	21,494
Amount for development wells	8,120
Capitalized interest	91
Total unproved and unevaluated	$ 264,419