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
Mar. 31, 2012
Mar. 31, 2011
Fair value of impaired properties and other assets    
Impairment Losses Recognized $ 5,126 $ 27,742
Fair value measurement on a nonrecurring basis | Properties, net
   
Fair value of impaired properties and other assets    
Impairment Losses Recognized 5,479  
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties, net
   
Fair value of impaired properties and other assets    
Assets 92,176  
Fair value measurement on a nonrecurring basis | Total | Properties, net
   
Fair value of impaired properties and other assets    
Assets $ 92,176