Subsequent Events (Textual) (Details) - Series E Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Millions	Apr. 11, 2017	Mar. 10, 2017
Subsequent Event [Line Items]
Redemption price per share		$ 25.00
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Subsequent Event [Line Items]
Redemption date		Apr. 11, 2017
Redemption price per share		$ 25.00
Subsequent Event [Member]
Subsequent Event [Line Items]
Redemption date	Apr. 11, 2017
Redemption of outstanding preferred shares	4,000,000
Redemption price per share	$ 25.00
Distribution payment date	Apr. 17, 2017
Distribution date of record	Mar. 30, 2017
Distribution amount per share	$ 0.50792
Distribution amount paid	$ 102.0
Preferred share redemption charge	$ 3.2
Subsequent Event [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Subsequent Event [Line Items]
Redemption of outstanding preferred shares	4,000,000