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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Fair value of impaired properties and other assets        
Impairment Losses Recognized $ 0 $ 20,183 $ (2,303) $ 47,925
Fair value measurement on a nonrecurring basis | Properties, net
        
Fair value of impaired properties and other assets        
Impairment Losses Recognized 2,214   7,693  
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties, net
        
Fair value of impaired properties and other assets        
Assets 202,250 [1],[2]   202,250 [1],[2]  
Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties, net
        
Fair value of impaired properties and other assets        
Assets $ 202,250 [1]   $ 202,250 [1]  
[1] Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[2] These fair value measurements were developed from third party sources, subject to our corroboration for reasonableness.