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Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)
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Mar. 31, 2012
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Dec. 31, 2011
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| Property And Equipment [Abstract] | ||
| Oil and natural gas properties | $ 1,130,838,000 | $ 1,035,754,000 |
| Office furniture and fixtures | 3,774,000 | 3,692,000 |
| Building | 3,926,000 | 4,049,000 |
| Land | 260,000 | 283,000 |
| Total property and equipment | 1,138,798,000 | 1,043,778,000 |
| Accumulated depletion, depreciation, amortization and impairment | (596,530,000) | (575,142,000) |
| Property and equipment, net | $ 542,268,000 | $ 468,636,000 |
| X | ||||||||||
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- Definition
The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount, as of the balance sheet date, of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount, at the balance sheet date, of long-lived, depreciable assets commonly used in offices and stores. Examples include desks, chairs, and store fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Oil and gas properties, gross, carried under the full cost method. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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