Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing	$ 203,843		$ 203,843		$ 226,885
Intangible assets:
In-place lease values	82,777		82,777		94,966
Leasing commissions and legal costs	21,019		21,019		23,508
Above-market leases	62,679		62,679		140,889
Deferred tax assets	30,643		30,643		32,197
Deferred compensation plan assets	52,006		52,006		45,857
Other assets	51,655		51,655		75,497
Deferred charges and other assets, gross	504,622		504,622		639,799
Less accumulated amortization	(226,823)		(226,823)		(249,396)
Deferred charges and other assets, net	277,799		277,799		390,403
In-place lease values, leasing commissions and legal costs
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization for intangible assets	67,599		67,599		$ 72,286
Amortization expense for intangible assets	$ 3,467	$ 3,114	$ 9,991	$ 10,504