Held for Sale/Disposed Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($)	Dec. 19, 2019 building
Held For Sale Assets [Line Items]
Number of properties	222			17
Gain on sales of real estate investments	$ 26,766	$ 9,391	$ 28,610
Held-for-sale
Held For Sale Assets [Line Items]
Number of properties | property	0
Disposed of by Sale | Washington D.C.
Held For Sale Assets [Line Items]
Number of properties sold | property	3	2
Disposed of by Sale | Miami
Held For Sale Assets [Line Items]
Number of properties sold | property	1	1
Disposed of by Sale | Los Angeles
Held For Sale Assets [Line Items]
Number of properties sold | property		1
Disposed of by Sale | Disposed assets | Washington D.C.
Held For Sale Assets [Line Items]
Proceeds from sale of property	$ 51,300	$ 22,500
Gain on sales of real estate investments	17,800	3,100
Disposed of by Sale | Disposed assets | Miami
Held For Sale Assets [Line Items]
Proceeds from sale of property	22,200	14,000
Gain on sales of real estate investments	$ 9,000	1,800
Disposed of by Sale | Disposed assets | Los Angeles
Held For Sale Assets [Line Items]
Proceeds from sale of property		12,400
Gain on sales of real estate investments		$ 4,500