Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing	$ 180,262		$ 180,262		$ 202,540
Intangible assets:
In-place lease values	62,274		62,274		78,171
Leasing commissions and legal costs	16,570		16,570		20,518
Above-market leases	55,809		55,809		59,916
Deferred tax assets	32,108		32,108		30,757
Deferred compensation plan assets	54,571		54,571		55,349
Other assets	66,113		66,113		60,475
Deferred charges and other assets, gross	467,707		467,707		507,726
Less accumulated amortization	(202,967)		(202,967)		(229,860)
Deferred charges and other assets, net	264,740		264,740		277,866
In-place lease values, leasing commissions and legal costs
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization for intangible assets	54,183		54,183		$ 66,322
Amortization expense for intangible assets	$ 1,996	$ 3,320	$ 5,715	$ 6,525