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Deferred Charges and Other Assets, net - Schedule of deferred charges and other assets, net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Leasing $ 213,550   $ 232,819
Intangible assets:      
In-place lease values 99,339   108,432
Leasing commissions and legal costs 24,830   25,958
Above-market leases 152,270   164,040
Deferred tax assets 31,517   29,006
Deferred compensation plan assets 51,983   52,221
Other assets 56,313   66,990
Deferred charges and other assets, gross 629,802   710,616
Less accumulated amortization (230,649)   (261,426)
Deferred charges and other assets, net 399,153   449,190
In-place lease values, leasing commissions and legal costs      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization for intangible assets 68,181   $ 74,507
Amortization expense for intangible assets $ 3,835 $ 6,004