Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 3)

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Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair value of impaired properties and other assets        
Exit Costs Included in Impairment Losses in Connection with Dispositions     $ (4,066) $ 0
Impairment Losses Recognized 46,096 0 41,260 42,983
Fair value measurement on a nonrecurring basis | Properties, net
        
Fair value of impaired properties and other assets        
Impairment Losses Recognized 52,900 [1]   60,593 [1]  
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties, net
        
Fair value of impaired properties and other assets        
Exit Costs Included in Impairment Losses in Connection with Dispositions 2,900   4,200  
Assets 369,312 [2],[3]   369,312 [2],[3]  
Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties, net
        
Fair value of impaired properties and other assets        
Assets $ 369,312 [2]   $ 369,312 [2]  
[1] Represents impairment losses, excluding exit costs of $2.9 million for the three months ended September 30, 2012 and $4.2 million for the nine months ended September 30, 2012.
[2] Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[3] These fair value measurements were developed from third party sources, subject to our corroboration for reasonableness.