Discontinued Operations (Details) - ft² ft² in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Promenade Bolingbrook [Member]
Summary of rental properties included in discontinued operations
Area of Real Estate Property		771
Period disposed		Q2-2014
Period status	Yes		Yes
Quartermaster Plaza [Member]
Summary of rental properties included in discontinued operations
Area of Real Estate Property		456
Period disposed		Q1-2014
Period status	0		Yes
Mesa del Sol - 5600 University SE [Member]
Summary of rental properties included in discontinued operations
Area of Real Estate Property		87
Period disposed		Q1-2014
Period status	0		Yes