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Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Leasing $ 162,652 $ 202,540  
Intangible assets:      
In-place lease values 74,298 78,171  
Leasing commissions and legal costs 21,096 20,518  
Above-market leases 80,120 59,916  
Deferred tax assets 30,767 30,757  
Deferred compensation plan assets 62,874 55,349  
Other assets 61,553 60,475  
Deferred charges and other assets, gross 493,360 507,726  
Less accumulated amortization (186,401) (229,860)  
Deferred charges and other assets, net 306,959 277,866  
In-place lease values, leasing commissions and legal costs      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization 47,249 66,322  
Amortization expense $ 9,412 $ 13,821 $ 13,635