Investments in Non-Consolidated Entities - Schedule of Investments in and Non-consolidated Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 56,464	$ 57,168
NNN JV
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Equity method investments	$ 31,615	39,288
Etna Park 70 LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	90.00%
Equity method investments	$ 12,514	8,352
Etna Park 70 East LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	90.00%
Equity method investments	$ 7,484	4,310
BSH Lessee L.P.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Equity method investments	$ 4,851	$ 5,218