Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) $ 66 $ 5,857 $ 1,368 $ 5,857
Fair value measurement on a nonrecurring basis | Properties, net
       
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries)   21,888 [1] 1,371 30,940 [1]
Fair value measurement on a nonrecurring basis | Properties, net | Significant Unobservable Inputs (Level 3)
       
Assets and liabilities measured at fair value on a non-recurring basis        
Assets   142,702 [2]   142,702 [2]
Fair value measurement on a nonrecurring basis | Properties, net | Total Estimated Fair Value
       
Assets and liabilities measured at fair value on a non-recurring basis        
Assets   $ 142,702 [2]   $ 142,702 [2]
[1] Represents impairment losses, excluding exit costs incurred of $186,000 for the three months and nine months ended September 30, 2013.
[2] Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.