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Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities | |||
| Exploration - expensed | $ 41,037 | $ 5,708 | $ 6,813 |
| Development | 45,700 | ||
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United States [Member]
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| Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities | |||
| Exploration - capitalized | 2,602 | ||
| Exploration - expensed | 38,159 | 2,083 | 392 |
| Acquisition | 1,630 | 9,495 | 2,240 |
| Development | 9,689 | 14,936 | |
| Total | 52,080 | 26,514 | 2,632 |
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International [Member]
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| Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities | |||
| Exploration - capitalized | 5,916 | 69 | 8,020 |
| Exploration - expensed | 2,878 | 3,625 | 6,421 |
| Acquisition | 10,000 | 455 | 1,200 |
| Development | 4,022 | 8,011 | 29,927 |
| Total | $ 22,816 | $ 12,160 | $ 45,568 |
| X | ||||||||||
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- Definition
The capitalized costs incurred during the period (excluded from amortization) 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Cost incurred, including capitalized costs and costs charged to expense, in acquisition of oil and gas properties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred 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: (i) 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. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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