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Summary of Significant Accounting Policies - Rental Property (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accounting Policies [Abstract] |  |  |
Buildings and Improvements, Estimated Useful Life | 33 years |  |
Property, Plant and Equipment, Useful Life, Minimum | 7 years |  |
Land Improvements Useful Life | 15 years |  |
Purchase Price Allocated to Assets, Useful Life, Minimum | 3 years |  |
Purchase Price Allocated to Assets, Useful Life, Maximum | 33 years |  |
Interest Costs Incurred, Capitalized | $ 1,200,000 | $ 393,000 | $ 1,500,000
Internal Development Costs, Captialized | 1,800,000 | 1,400,000 | 1,500,000
Real Estate Depreciation | $ 73,700,000 | $ 66,200,000 | $ 64,500,000

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- Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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