Deferred Costs, Acquired Lease Intangibles and Goodwill - Deferred Costs, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Leasing costs	$ 201,987	$ 199,033
Total deferred costs, gross amount	434,428	448,542
Less: accumulated amortization	(223,072)	(224,598)
Total deferred costs, net, excluding net deferred financing costs	211,356	223,944
Acquired in-place lease value and deferred leasing costs
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	187,724	200,296
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	$ 44,717	$ 49,213