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Fair Value of Derivatives and Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ 0  
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Derivatives - Interest rate contracts 299 0
Derivatives - Interest rate contracts (b) 2,382 4,965
Unsecured debt instruments    
Redeemable noncontrolling interests in the Operating Partnership (d) 249,814 217,597
Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a) 18,858  
Total assets 19,157  
Unsecured debt instruments    
Total liabilities 3,742,913 3,651,141
Redeemable noncontrolling interests in the Operating Partnership (d) 249,814 217,597
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 299 [1]  
Derivatives - Interest rate contracts (b) 2,382 [1] 4,965 [1]
Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 451,582 [2] 466,375 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 31,337 [2] 63,595 [2]
Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 94,700 [2] 94,700 [2]
Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 655,035 [2] 661,094 [2]
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 [2] 211,409 [2]
Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 160,000 [3]  
Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 2,136,468 [3] 2,149,003 [3]
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a) 0  
Total assets 0  
Unsecured debt instruments    
Total liabilities 0 0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a) 0  
Total assets 299  
Unsecured debt instruments    
Total liabilities 2,382 4,965
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Total assets 18,858  
Unsecured debt instruments    
Total liabilities 3,740,531 3,646,176
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a) 18,318 83,033
Total assets 18,617 83,033
Unsecured debt instruments    
Total liabilities 3,630,574 3,528,668
Redeemable noncontrolling interests in the Operating Partnership (d) 249,814 217,597
Carrying (Reported) Amount, Fair Value Disclosure [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 (b) 2,382 4,965
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 438,172 445,706
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 31,337 63,595
Carrying (Reported) Amount, Fair Value Disclosure [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
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 623,754 626,667
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 211,409
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 160,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 2,068,820 2,081,626
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a)   83,833
Total assets   83,833
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a)   0
Total assets   0
Unsecured debt instruments    
Redeemable noncontrolling interests in the Operating Partnership (d) 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | 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  
Derivatives - Interest rate contracts (b) 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | 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
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a)   0
Total assets   0
Estimate of Fair Value, Fair Value Disclosure [Member] | 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 299  
Derivatives - Interest rate contracts (b) 2,382  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | 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
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 0 0
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis    
Notes receivable (a) 18,858 83,833
Total assets   83,833
Unsecured debt instruments    
Redeemable noncontrolling interests in the Operating Partnership (d) 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | 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  
Derivatives - Interest rate contracts (b) 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 451,582 466,375
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 31,337 63,595
Estimate of Fair Value, Fair Value Disclosure [Member] | 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
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
    
Secured debt instruments - fixed rate    
Secured debt instruments - fixed rate 655,035 661,094
Secured debt instruments - variable rate    
Secured debt instruments - variable rate 211,409 211,409
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) 160,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
    
Unsecured debt instruments    
Unsecured debt instruments (c) $ 2,136,468 $ 2,149,003
[1] See Note 6, Secured and Unsecured Debt
[2] See Note 2, Significant Accounting Policies
[3] See Note 10, Derivatives and Hedging Activity