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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) $ 0 $ 0 $ 0 $ (4,836)
Exit costs on property dispositions     0 (1,248)
Properties,net | Fair value measurement on a nonrecurring basis
        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) 7,195 [1] 2,214 [1],[2] 9,052 [1] 7,693 [1],[2]
Properties,net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
        
Assets and liabilities measured at fair value on a non-recurring basis        
Assets 113,144 [1],[3] 202,250 [1] 113,144 [1],[3] 202,250 [1]
Exit costs on property dispositions   105   1,200
Properties,net | Fair value measurement on a nonrecurring basis | Total Estimated Fair Value
        
Assets and liabilities measured at fair value on a non-recurring basis        
Assets $ 113,144 [1] $ 202,250 [1] $ 113,144 [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] Represents impairment losses, excluding exit costs incurred of $105,000 for the three months ended June 30, 2012 and $1.2 million for the six months ended June 30, 2012.
[3] This fair value measurement was developed by a third party source, subject to our corroboration for reasonableness.