Accounting for the Impairment or Disposal of Long-Lived Assets Asset Impairment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Property, Plant and Equipment [Line Items]    
Impairment - real estate assets $ 15,739 $ 0
Richmond Hampton Roads [Member]    
Property, Plant and Equipment [Line Items]    
Impairment - real estate assets 13,400  
Southeastern PA [Member]    
Property, Plant and Equipment [Line Items]    
Impairment - real estate assets $ 2,300