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Fair Value of Derivatives and Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Unsecured debt instruments      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount $ 225,595 $ 223,418  
Fair Value, Measurements, Recurring [Member]
      
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis      
Notes receivable 67,172    
Total assets 67,172    
Unsecured debt instruments      
Total liabilities 3,742,646   3,654,305
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 225,595   223,418
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 9,224 [1]   11,022 [1]
Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
      
Secured debt instruments - fixed rate      
Secured debt instruments - fixed rate 487,297 [2]   494,728 [2]
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 [2]   37,415 [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 681,792 [2]   689,295 [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 170,000 [3]   76,000 [3]
Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
      
Unsecured debt instruments      
Unsecured debt instruments 2,050,809 [3]   2,039,736 [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 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 0    
Total assets 0    
Unsecured debt instruments      
Total liabilities 9,224   11,022
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 67,172    
Unsecured debt instruments      
Total liabilities 3,733,422   3,643,283
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 66,193 64,006  
Total assets 66,193 64,008  
Unsecured debt instruments      
Total liabilities 3,508,331 3,420,355  
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 225,595 223,418  
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   2  
Derivatives - Interest rate contracts 9,224 11,022  
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 453,076 455,533  
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415 37,415  
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 629,063 631,078  
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 170,000 76,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
      
Unsecured debt instruments      
Unsecured debt instruments 1,903,444 1,903,198  
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   64,930  
Total assets   64,932  
Estimate of Fair Value, 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   2  
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   0  
Total assets   0  
Unsecured debt instruments      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 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 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 0   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 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   0  
Total assets   2  
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   2  
Derivatives - Interest rate contracts 9,224    
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 0   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 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 67,172 64,930  
Total assets   64,930  
Unsecured debt instruments      
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount 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 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 487,297   494,728
Secured debt instruments - variable rate      
Secured debt instruments - variable rate 37,415   37,415
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 681,792   689,295
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 170,000   76,000
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 $ 2,050,809   $ 2,039,736
[1] See Note 6, Secured and Unsecured Debt
[2] See Note 2, Significant Accounting Policies
[3] See Note 10, Derivatives and Hedging Activity