Intangible Assets (Intangibles - Future Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Future Amortization of Intangible Assets:
Weighted average remaining lease term	10 years
2020	$ 43,013
2021	32,823
2022	22,376
2023	17,811
2024	13,316
Thereafter	43,531
Finite-lived intangibles, net	172,870
Below Market Rents
Future Amortization of Intangible Liabilities:
2020	(19,379)
2021	(14,201)
2022	(11,065)
2023	(9,365)
2024	(8,080)
Thereafter	(19,342)
Finite-lived intangible liabilities, net	$ (81,432)
Weighted average remaining lease term	7 years
Above Market Ground Lease
Future Amortization of Intangible Liabilities:
2020	$ (46)
2021	(46)
2022	(46)
2023	(46)
2024	(46)
Thereafter	(1,443)
Finite-lived intangible liabilities, net	$ (1,673)
Weighted average remaining lease term	36 years
Below Market Ground Lease
Future Amortization of Intangible Assets:
2020	$ 276
2021	276
2022	276
2023	276
2024	276
Thereafter	16,136
Finite-lived intangible assets, net	$ 17,516	$ 17,792
Weighted average remaining lease term	65 years
Above Market Rents
Future Amortization of Intangible Assets:
2020	$ 8,036
2021	6,660
2022	5,267
2023	4,222
2024	3,339
Thereafter	8,175
Finite-lived intangible assets, net	$ 35,699	20,453
Weighted average remaining lease term	7 years
In Place Leases
Future Amortization of Intangible Assets:
2020	$ 54,126
2021	40,134
2022	27,944
2023	22,724
2024	17,827
Thereafter	40,005
Finite-lived intangible assets, net	$ 202,760	$ 105,964
Weighted average remaining lease term	7 years