Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing	$ 179,355		$ 202,540
Intangible assets:
In-place lease values	66,561		78,171
Leasing commissions and legal costs	18,080		20,518
Above-market leases	56,377		59,916
Deferred tax assets	30,789		30,757
Deferred compensation plan assets	44,458		55,349
Other assets	55,018		60,475
Deferred charges and other assets, gross	450,638		507,726
Less accumulated amortization	(199,990)		(229,860)
Deferred charges and other assets, net	250,648		277,866
In-place lease values, leasing commissions and legal costs
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization for intangible assets	56,075		$ 66,322
Amortization expense for intangible assets	$ 3,719	$ 3,205