Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended			1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Sold Properties [Member] Property	Aug. 07, 2014 Subsequent Event [Member]	Aug. 07, 2014 Subsequent Event [Member] 6% Convertible Guaranteed Note [Member]	Aug. 07, 2014 Subsequent Event [Member] Sold Properties [Member] Property	Aug. 07, 2014 Office Building [Member] Subsequent Event [Member] Philadelphia Pennsylvania [Member]
Subsequent Event [Line Items]
Number of properties sold			6			3
Proceeds from sale of real estate	$ 33,226	$ 47,236		$ 48,300
Amount of debt converted					1,400
Converted debt, shares issued	414,637	6,167,111			209,466
Payments to acquire additional interest in subsidiaries	$ 1,962	$ 0					$ 2,100
Percent ownership in real estate							87.50%