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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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6 Months Ended |
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Jun. 30, 2011
years
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Use Rights [Member]
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| Useful Life, Minimum (years) | 15 |
| Useful Life, Maximum (years) | 28 |
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Utility Contracts [Member]
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| Useful Life (years) | 5 |
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Easements [Member]
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| Useful Life (years) | 30 |
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Lease Agreements [Member]
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| Useful Life, Minimum (years) | 1.5 |
| Useful Life, Maximum (years) | 4.5 |
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Unpatented Technology [Member]
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| Useful Life (years) | 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 | ||||||||||
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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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