Rental Property - Deferred Leasing Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	$ 703,308		$ 703,308		$ 716,453
Deferred leasing intangibles assets, accumulated amortization	(264,262)		(264,262)		(241,304)
Deferred leasing intangibles, net	439,046		439,046		475,149
Below market lease, gross	39,167		39,167		38,802
Below market lease, accumulated amortization	(14,176)		(14,176)		(12,064)
Below market lease, net	24,991		24,991		26,738
Net decrease to rental income related to above and below market lease amortization	1,482	$ 1,248	3,646	$ 3,361
Above market leases
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	93,002		93,002		92,607
Deferred leasing intangibles assets, accumulated amortization	(36,711)		(36,711)		(32,115)
Deferred leasing intangibles, net	56,291		56,291		60,492
Other intangible lease assets
Finite-Lived Intangible Assets [Line Items]
Deferred leasing intangibles, gross	610,306		610,306		623,846
Deferred leasing intangibles assets, accumulated amortization	(227,551)		(227,551)		(209,189)
Deferred leasing intangibles, net	382,755		382,755		$ 414,657
Amortization expense related to other intangible lease assets	21,780	$ 18,472	63,158	$ 53,185
Estimated Net Amortization of In-Place Leases, Leasing Commissions and Tenant Relationships
Remainder of 2020	18,290		18,290
2021	65,614		65,614
2022	56,254		56,254
2023	47,759		47,759
2024	38,947		38,947
Net decrease to rental income related to above and below market lease amortization
Estimated Net Amortization of In-Place Leases, Leasing Commissions and Tenant Relationships
Remainder of 2020	859		859
2021	2,764		2,764
2022	2,298		2,298
2023	2,504		2,504
2024	$ 2,812		$ 2,812