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Subsequent Events (Details) - Office Building - USD ($) $ in Millions	Oct. 01, 2015	Dec. 31, 2015	Aug. 26, 2015
7000 Central Park
Subsequent Event [Line Items]
Ownership interest (as a percent)			40.00%
7000 Central Park \| Forecast
Subsequent Event [Line Items]
Gross sale price		$ 85.3
Two Buckhead Plaza \| Subsequent Event
Subsequent Event [Line Items]
Gross purchase price	$ 80.0
Interest rate	6.43%
Two Buckhead Plaza \| Subsequent Event \| First Mortgage
Subsequent Event [Line Items]
Outstanding balance	$ 52.0