Subsequent Events (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 03, 2015	Apr. 06, 2015	Jun. 30, 2015
Subsequent Event [Line Items]
Repayments of secured debt	$ 17,344,000	$ 2,782,000
Subsequent Event
Subsequent Event [Line Items]
Repayments of secured debt			68,000,000
Payments of debt extinguishment costs			3,000,000
Peachtree Dunwoody Pavilion | Scenario, Forecast | Office Building
Subsequent Event [Line Items]
Gross sale price					52,500,000
North Belt | Scenario, Forecast | Office Building
Subsequent Event [Line Items]
Gross sale price					10,200,000
3350 Peachtree | Subsequent Event
Subsequent Event [Line Items]
Repayments of secured debt				32,000,000
Payments of debt extinguishment costs				$ 320,000