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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest Rate Fair Value Hedge Derivative at Fair Value, Net $ (871) $ (2,284)  
Fair value assets measured on non recurring basis unobservable input reconciliation      
Asset Impairment Charges, Investment Properties 77,348 28,967 0
Fair Value, Measurements, Nonrecurring [Member]
     
Fair value assets measured on non recurring basis unobservable input reconciliation      
Asset Impairment Charges, Investment Properties (77,348) (28,967)  
Asset Impairment Charges, Investment in Unconsolidated Entities (5,165) (96,471)  
Total Impairment Gain (Losses) (82,513) (125,438)  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair value assets measured on non recurring basis unobservable input reconciliation      
Fair Value Measurements, Investment properties 146,085 76,346  
Fair Value Measurements, Investment in unconsolidated entities 36,469 43,658  
Fair Value Measurements, Total $ 182,554 $ 120,004