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