Notes Receivable, Net - Schedule of Notes Receivable (Parenthetical) (Details) $ in Thousands	Jun. 30, 2020 USD ($) NotesReceivable	Apr. 01, 2020	Dec. 31, 2019 USD ($)	Mar. 28, 2018	Nov. 16, 2017
Accounts Notes And Loans Receivable [Line Items]
Number of notes receivable | NotesReceivable	8
Notes receivable	$ 135,562		$ 114,943
Core Portfolio
Accounts Notes And Loans Receivable [Line Items]
Number of notes receivable | NotesReceivable	6
Notes receivable	$ 96,794		$ 76,467
Equity method investment, ownership percentage by third party			24.78%	14.11%	38.89%
Core Portfolio | Brandywine Portfolio
Accounts Notes And Loans Receivable [Line Items]
Notes receivable	$ 38,700		$ 38,700
Equity method investment, ownership percentage by third party	24.78%	24.78%
OP Unit Holders | Core Portfolio
Accounts Notes And Loans Receivable [Line Items]
Number of notes receivable | NotesReceivable	2
Notes receivable	$ 6,500		$ 6,500