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Goodwill And Other Intangible Assets And Liabilities (Estimated Useful Lives Of Intangible Assets Subject To Periodic Amortization On A Straight-Line Basis) (Details)
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3 Months Ended |
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Mar. 31, 2012
Y
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Permits [Member]
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| Finite-Lived Intangible Assets [Line Items] | |
| Intangible Assets Estimated Useful Life Minimum (years) | 15 |
| Intangible Assets Estimated Useful Life Maximum (years) | 28 |
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Utility Contracts [Member]
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| Finite-Lived Intangible Assets [Line Items] | |
| Useful Life (years) | 5 |
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Leases [Member]
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| Finite-Lived Intangible Assets [Line Items] | |
| Intangible Assets Estimated Useful Life Minimum (years) | 1.5 |
| Intangible Assets Estimated Useful Life Maximum (years) | 4.5 |
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- Definition
The average 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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- Details
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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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- 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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