Subsequent Events (Details) - Subsequent Event [Member] - USD ($) $ in Millions	1 Months Ended
	Feb. 24, 2017	Jan. 31, 2017
Fund III [Member] | Arundel Plaza [Member]
Subsequent Event [Line Items]
Sales Price	$ 28.8
Fund IV [Member] | 2819 Kennedy Boulevard [Member]
Subsequent Event [Line Items]
Sales Price		$ 19.0
Wake Forest Crossing [Member] | Fund IV [Member]
Subsequent Event [Line Items]
Borrowings, amount	$ 24.0
London Interbank Offered Rate (LIBOR) [Member] | Wake Forest Crossing [Member] | Fund IV [Member]
Subsequent Event [Line Items]
Basis spread on variable rate	1.60%