Accounting for the Impairment or Disposal of Long-Lived Assets Asset Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Impairment - real estate assets	$ 1,036	$ 0	$ 16,775	$ 0
Maryland [Member]
Property, Plant and Equipment [Line Items]
Impairment - real estate assets	$ 1,000		1,000
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