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 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 $ 66 $ 5,857 $ 1,368 $ 5,857
Exit costs on property dispositions     0 186
Properties, net | Fair value measurement on a nonrecurring basis
       
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses   21,888 [1] 1,371 30,940 [1]
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        
Exit costs on property dispositions   186   186
Property Conveyances | Fair value measurement on a nonrecurring basis
       
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses   10,400    
Strategic Reallocation Plan | Fair value measurement on a nonrecurring basis
       
Assets and liabilities measured at fair value on a non-recurring basis        
Exit costs on property dispositions       186
Other Properties with Shortened Holding Periods | Fair value measurement on a nonrecurring basis
       
Assets and liabilities measured at fair value on a non-recurring basis        
Number of properties with a shortened holding period (in properties)   2    
Greater Baltimore | Other Properties with Shortened Holding Periods | Fair value measurement on a nonrecurring basis
       
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses   5,900    
Discontinued Operations | Strategic Reallocation Plan | Fair value measurement on a nonrecurring basis
       
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses       $ 14,800
[1] Represents impairment losses, excluding exit costs incurred of $186,000 for the three months and nine months ended September 30, 2013.