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Investment in Office Properties - 2015 Acquisitions (Details) - Office Building - USD ($) $ in Millions	Oct. 01, 2015	Sep. 25, 2015	Jan. 08, 2015
One Buckhead Plaza
Real Estate Properties [Line Items]
Gross purchase price			$ 157.0
Harborview Plaza
Real Estate Properties [Line Items]
Gross purchase price		$ 49.0
Two Buckhead Plaza
Real Estate Properties [Line Items]
Gross purchase price	$ 80.0
Interest rate	6.43%
Two Buckhead Plaza \| First Mortgage
Real Estate Properties [Line Items]
Outstanding balance	$ 52.0