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Fair Value Measurements (Assets Measured On Nonrecurring Basis) (Details) (USD $)
In Thousands
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Fair Value Measurements [Line Items]  
Total$ 182,228$ 13,025
Total(68,909)[1](15,142)[1]
Impaired Property [Member]
  
Fair Value Measurements [Line Items]  
Property94,5512,325
Impairment loss(33,853)[1](2,827)[1]
Impaired Property [Member] | Quoted Prices In Active Markets For Identical Assets And Liabilities (Level1) [Member]
  
Fair Value Measurements [Line Items]  
Property  
Impaired Property [Member] | Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value Measurements [Line Items]  
Property389 
Impaired Property [Member] | Significant Unobservable Inputs (Level 3) [Member]
  
Fair Value Measurements [Line Items]  
Property94,1622,325
Impaired Property Held For Sale [Member]
  
Fair Value Measurements [Line Items]  
Property Held for Sale54,921 
Impairment loss(14,845)[1] 
Impaired Property Held For Sale [Member] | Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value Measurements [Line Items]  
Property Held for Sale54,921 
Impaired Investment In Real Estate Joint Ventures And Partnerships [Member]
  
Fair Value Measurements [Line Items]  
Investment in Real Estate Joint Ventures and Partnerships6,033 
Impairment losses related to partially owned real estate joint ventures and partnerships(1,474)[1] 
Impaired Investment In Real Estate Joint Ventures And Partnerships [Member] | Significant Unobservable Inputs (Level 3) [Member]
  
Fair Value Measurements [Line Items]  
Investment in Real Estate Joint Ventures and Partnerships6,033 
Subordinate Tax Increment Revenue Bonds [Member]
  
Fair Value Measurements [Line Items]  
Investments 10,700
Investments26,723 
Impairment loss on investments(18,737)[1](11,717)[1]
Subordinate Tax Increment Revenue Bonds [Member] | Quoted Prices In Active Markets For Identical Assets And Liabilities (Level1) [Member]
  
Fair Value Measurements [Line Items]  
Investments  
Subordinate Tax Increment Revenue Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value Measurements [Line Items]  
Investments  
Subordinate Tax Increment Revenue Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
  
Fair Value Measurements [Line Items]  
Investments 10,700
Investments26,723 
Significant Other Observable Inputs (Level 2) [Member] | Subordinate Tax Increment Revenue Note [Member]
  
Fair Value Measurements [Line Items]  
Investments  
Subordinate Tax Increment Revenue Note [Member]
  
Fair Value Measurements [Line Items]  
Impairment loss on investments (598)[1]
Subordinate Tax Increment Revenue Note [Member] | Quoted Prices In Active Markets For Identical Assets And Liabilities (Level1) [Member]
  
Fair Value Measurements [Line Items]  
Investments  
Quoted Prices In Active Markets For Identical Assets And Liabilities (Level1) [Member]
  
Fair Value Measurements [Line Items]  
Total  
Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value Measurements [Line Items]  
Total55,310 
Significant Unobservable Inputs (Level 3) [Member]
  
Fair Value Measurements [Line Items]  
Total$ 126,918$ 13,025
[1] Total gains (losses) exclude impairments on disposed assets.