Deferred Costs, Acquired Lease Intangibles and Goodwill - Deferred Costs, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Leasing costs	$ 200,792	$ 199,033
Total deferred costs, gross amount	439,083	448,542
Less: accumulated amortization	(220,505)	(224,598)
Total deferred costs, net, excluding net deferred financing costs	218,578	223,944
Acquired in-place lease value and deferred leasing costs
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	193,478	200,296
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	$ 44,813	$ 49,213