Real Estate - Estimated Annual Amortization (Details) $ in Thousands	Dec. 31, 2019 USD ($)
In-place lease valuation, net
2020	$ (2,150)
2021	(2,066)
2022	(2,467)
2023	(2,415)
2024	(1,593)
Tenant origination and absorption costs
2020	64,739
2021	57,151
2022	54,050
2023	49,246
2024	41,479
Ground leasehold improvements
2020	291
2021	290
2022	290
2023	290
2024	291
Other leasing costs
2020	4,911
2021	5,668
2022	5,673
2023	5,571
2024	$ 5,533