Goodwill And Other Intangible Assets And Liabilities (Estimated Useful Lives Of Intangible Assets Subject To Periodic Amortization On A Straight-Line Basis) (Details) |
9 Months Ended |
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Sep. 30, 2011
years
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Use Rights [Member] |
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| Useful Life, Minimum (years) | 15 |
| Useful Life, Maximum (years) | 28 |
Utility Contracts [Member] |
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| Useful Life (years) | 5 |
Easements [Member] |
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| Useful Life (years) | 30 |
Lease Agreements [Member] |
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| Useful Life, Minimum (years) | 1.5 |
| Useful Life, Maximum (years) | 4.5 |
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- Definition The useful life of all finite-lived intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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