Intangibles - Summary of Carrying Amount of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Cost	$ 540,803	$ 520,426
Accumulated Amortization	(189,242)	(160,138)
Net	351,561	360,288
Liabilities
Below-market leases, net	5,663	6,096
Lease liability, cost	74,693	63,665
Lease liability, accumulated amortization	(675)	(375)
Lease liability	74,018	63,290
Cost	89,282	77,719
Accumulated Amortization	(9,601)	(8,333)
Net	79,681	69,386
In-place leases
Assets
Cost	355,270	346,438
Accumulated Amortization	(165,411)	(140,937)
Net	189,859	205,501
Above-market leases
Assets
Cost	43,386	43,300
Accumulated Amortization	(19,741)	(16,856)
Net	23,645	26,444
Leasehold interest
Assets
Cost	712	712
Accumulated Amortization	(346)	(302)
Net	366	410
Right-of-use lease assets
Assets
Cost	141,435	129,976
Accumulated Amortization	(3,744)	(2,043)
Net	137,691	127,933
Below-market leases
Liabilities
Below-market leases, cost	14,589	14,054
Below-market leases, accumulated amortization	(8,926)	(7,958)
Below-market leases, net	$ 5,663	$ 6,096