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Summary of Significant Accounting Policies - Rental Property (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2011
years
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Dec. 31, 2010
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Dec. 31, 2009
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| Buildings and Improvements, Estimated Useful Life | 33 | ||
| Land Improvements Useful Life | 15 | ||
| Equipment, Useful Life | 7 | ||
| Purchase Price Allocated to Assets, Useful Life, Minimum | 3 | ||
| Purchase Price Allocated to Assets, Useful Life, Maximum | 33 | ||
| Interest Costs Incurred, Capitalized | $ 393,000 | $ 1,500,000 | $ 300,000 |
| Internal Development Costs, Captialized | 1,400,000 | 1,500,000 | 1,500,000 |
| Real Estate Depreciation | $ 66,200,000 | $ 64,500,000 | $ 64,500,000 |
| X | ||||||||||
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- Definition
Buildings and Improvements, Estimated Useful Life No definition available.
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| X | ||||||||||
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- Definition
Equipment, Useful Life No definition available.
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| X | ||||||||||
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- Definition
Internal Development Costs, Captialized No definition available.
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| X | ||||||||||
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- Definition
Land Improvements Useful Life No definition available.
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| X | ||||||||||
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- Definition
Purchase Price Allocated to Assets, Useful Life, Maximum No definition available.
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| X | ||||||||||
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- Definition
Purchase Price Allocated to Assets, Useful Life, Minimum No definition available.
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| X | ||||||||||
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- Definition
Real Estate Depreciation No definition available.
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| X | ||||||||||
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- Definition
Total interest costs incurred during the period that are capitalized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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