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Fair Value of Derivatives and Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Contingent consideration accrued in business combination   $ 3,000
Unsecured debt instruments    
Redeemable non-controlling interests 243,305 236,475 [1]
Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Receivable, Fair Value Disclosure 45,419  
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 45,436 89
Contingent consideration accrued in business combination 3,000 3,000 [2]
Unsecured debt instruments    
Total liabilities 3,568,367 4,104,800
Redeemable non-controlling interests 243,305 236,475 [1]
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 17 89 [3]
Derivatives - Interest rate contracts 13,404 13,660 [3]
Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 509,387 635,531 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 37,415 151,685 [4]
Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 94,700 94,700 [4]
Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 690,817 799,584 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 310,451 [4]
Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 0 421,000 [5]
Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 2,008,235 1,675,189 [5]
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Receivable, Fair Value Disclosure 0  
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 0 0
Contingent consideration accrued in business combination 0 0 [2]
Unsecured debt instruments    
Total liabilities 0 0
Redeemable non-controlling interests 0 0 [1]
Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 0 0 [3]
Derivatives - Interest rate contracts 0 0 [3]
Level 1 [Member] | Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [4]
Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [4]
Level 1 [Member] | Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [4]
Level 1 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 0 0 [5]
Level 1 [Member] | Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 0 0 [5]
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Receivable, Fair Value Disclosure 0  
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 17 89
Contingent consideration accrued in business combination 0 0 [2]
Unsecured debt instruments    
Total liabilities 13,404 13,660
Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 17 89 [3]
Derivatives - Interest rate contracts 13,404 13,660 [3]
Level 2 [Member] | Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [4]
Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [4]
Level 2 [Member] | Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0 [4]
Level 2 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 0 0 [5]
Level 2 [Member] | Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 0 0 [5]
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes Receivable, Fair Value Disclosure 45,419  
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 45,419 0
Contingent consideration accrued in business combination 3,000 3,000 [2]
Unsecured debt instruments    
Total liabilities 3,554,963 4,091,140
Redeemable non-controlling interests 0 0 [1]
Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 0 0 [3]
Derivatives - Interest rate contracts 0 0 [3]
Level 3 [Member] | Mortgage notes payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 509,387 635,531 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 37,415 151,685 [4]
Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 94,700 94,700 [4]
Level 3 [Member] | Credit Facilities [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 690,817 799,584 [4]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 310,451 [4]
Level 3 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments 0 421,000 [5]
Level 3 [Member] | Unsecured Debt [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments $ 2,008,235 $ 1,675,189 [5]
[1] See Note 9, "Noncontrolling Interests"
[2] The fair value of the contingent purchase consideration is related to our acquisition of a development property in a consolidated joint venture in 2011. (See Note 5, “Joint Ventures.”)
[3] See Note 11, “Derivatives and Hedging Activity”
[4] See Note 6, “Secured Debt”
[5] See Note 7, “Unsecured Debt”