Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2) (Fair value measurement on a nonrecurring basis, Properties,net, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Assets and liabilities measured at fair value on a non-recurring basis  
Impairment losses (recoveries) $ 1,857
Significant Unobservable Inputs (Level 3)
 
Assets and liabilities measured at fair value on a non-recurring basis  
Assets 7,250
Total Estimated Fair Value
 
Assets and liabilities measured at fair value on a non-recurring basis  
Assets $ 7,250