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Summary of Significant Accounting Policies (Details 2)
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12 Months Ended |
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Dec. 31, 2011
form
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| Share-Based Compensation | |
| Forms of share-based compensation issued in 2010 and 2011 | 2 |
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Market concentration premium
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| Intangible assets and deferred revenue on real estate acquisitions | |
| Period during which intangible assets will be amortized (in years) | 40 |
| X | ||||||||||
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- Definition
Represents the number of forms of awards issued under the share-based compensation plan. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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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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| X | ||||||||||
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- Details
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