Equity Investments in Unconsolidated Joint Ventures - Information of Fees Earned (Details) - Unconsolidated Joint Ventures - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 228	$ 39	$ 579	$ 90
Management fees
Schedule of Equity Method Investments [Line Items]
Total revenue	206	37	439	64
Leasing fees
Schedule of Equity Method Investments [Line Items]
Total revenue	22	2	140	2
Construction fees
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 0	$ 0	$ 0	$ 24