Real Estate - Schedule of Construction in Progress (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 01, 2019	Dec. 31, 2018
Real Estate [Line Items]
Development in process	$ 335,644		$ 185,972
The Waycroft
Real Estate [Line Items]
Development in process	255,443		162,176
7316 Wisconsin Avenue
Real Estate [Line Items]
Development in process	44,638	$ 42,600	0
Ashbrook Marketplace
Real Estate [Line Items]
Development in process	19,128		11,124
Other
Real Estate [Line Items]
Development in process	$ 16,435		$ 12,672