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Summary of Significant Accounting Policies (Construction in Progress) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Construction in Progress [Line Items] |  |  |
Internal direct construction costs capitalized related to development of properties and land holdings | $ 3,500,000 | $ 3,400,000 | $ 3,900,000
Interest costs, capitalized during period | 2,000,000 | 10,400,000 | 8,900,000
Salaries (including bonuses and benefits) capitalized during the period | 3,539,000 | 3,398,000 | 3,927,000
Development [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries (including bonuses and benefits) capitalized during the period | 0 | 2,331,000 | 1,772,000
Redevelopment [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries (including bonuses and benefits) capitalized during the period | 0 | 127,000 | 398,000
Tenant Improvements [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries (including bonuses and benefits) capitalized during the period | $ 3,539,000 | $ 940,000 | $ 1,757,000

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- Definition The amount of interest that was capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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