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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Level 2
Dec. 31, 2011
Level 2
Sep. 30, 2012
Real estate on which impairment losses were recognized
Nonrecurring basis
Level 3
Sep. 30, 2012
Real estate on which impairment losses were recognized
Nonrecurring basis
Level 3
Discounted Cash Flow
Minimum
Sep. 30, 2012
Real estate on which impairment losses were recognized
Nonrecurring basis
Level 3
Discounted Cash Flow
Maximum
Fair Value Measurements              
Fair Value         $ 40,154    
Discount rate (as a percent)           9.53% 13.00%
Terminal capitalization rate (as a percent)           8.28% 10.00%
Market rent growth rate (as a percent)           0.00% 3.00%
Expense growth rate (as a percent)           0.00% 3.00%
Financial Instruments not Reported at Fair Value              
Carrying Amount 2,173,749 2,367,401 2,173,749 2,367,401      
Fair Value     $ 2,157,714 $ 2,269,235