Intangible Assets - Intangibles - Future Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Future Amortization of Intangible Assets:
Weighted average remaining lease term	10 years
2021	$ 29,946
2022	20,708
2023	16,648
2024	12,053
2025	7,745
Thereafter	30,544
Finite-lived intangibles, net	117,644
Below Market Rents
Future Amortization of Intangible Liabilities:
2021	(14,616)
2022	(11,677)
2023	(10,040)
2024	(8,929)
2025	(8,197)
Thereafter	(14,760)
Finite-lived intangible liabilities, net	$ (68,219)
Weighted average remaining lease term	7 years
Above Market Ground Lease
Future Amortization of Intangible Liabilities:
2021	$ (46)
2022	(46)
2023	(46)
2024	(46)
2025	(46)
Thereafter	(1,397)
Finite-lived intangible liabilities, net	$ (1,627)
Weighted average remaining lease term	35 years
Below Market Ground Lease
Future Amortization of Intangible Assets:
2021	$ 276
2022	276
2023	276
2024	276
2025	276
Thereafter	15,860
Finite-lived intangible assets, net	$ 17,240	$ 17,516
Weighted average remaining lease term	64 years
Above Market Rents
Future Amortization of Intangible Assets:
2021	$ 5,927
2022	4,807
2023	3,921
2024	3,063
2025	2,011
Thereafter	5,231
Finite-lived intangible assets, net	$ 24,960	35,699
Weighted average remaining lease term	7 years
In Place Leases
Future Amortization of Intangible Assets:
2021	$ 38,405
2022	27,348
2023	22,537
2024	17,689
2025	13,701
Thereafter	25,610
Finite-lived intangible assets, net	$ 145,290	$ 202,760
Weighted average remaining lease term	6 years