Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing	$ 202,540	$ 226,885
Intangible assets:
In-place lease values	78,171	94,966
Leasing commissions and legal costs	20,518	23,508
Above-market leases	59,916	140,889
Deferred tax assets	30,757	32,197
Deferred compensation plan assets	55,349	45,857
Other assets	60,475	75,497
Deferred charges and other assets, gross	507,726	639,799
Less accumulated amortization	(229,860)	(249,396)
Deferred charges and other assets, net	277,866	390,403
In-place lease values, leasing commissions and legal costs
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	66,322	72,286
Amortization expense	$ 13,821	$ 13,635	$ 19,958