Real Estate - Schedule of Construction in Progress (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Real Estate [Line Items]
Construction in progress	$ 101,359	$ 335,644
The Waycroft
Real Estate [Line Items]
Construction in progress	32,298	255,443
7316 Wisconsin Avenue
Real Estate [Line Items]
Construction in progress	48,442	44,638
Ashbrook Marketplace
Real Estate [Line Items]
Construction in progress	8,669	19,128
Other
Real Estate [Line Items]
Construction in progress	$ 11,950	$ 16,435