Discontinued Operations (Details 2) - Jun. 30, 2014 - USD ($)	Total	Total
Gain (Loss) on Disposition of Rental Properties [Line Items]
Pre-tax gain on disposition of rental properties	$ 1,276,000	$ 28,100,000
Promenade Bolingbrook [Member]
Gain (Loss) on Disposition of Rental Properties [Line Items]
Pre-tax gain on disposition of rental properties	1,276,000	1,276,000
Quartermaster Plaza [Member]
Gain (Loss) on Disposition of Rental Properties [Line Items]
Pre-tax gain on disposition of rental properties	0	26,373,000
Mesa del Sol - 5600 University SE [Member]
Gain (Loss) on Disposition of Rental Properties [Line Items]
Pre-tax gain on disposition of rental properties	$ 0	$ 451,000