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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Leasing $ 215,499   $ 215,499   $ 232,819
Intangible assets:          
In-place lease values 97,204   97,204   108,432
Leasing commissions and legal costs 24,421   24,421   25,958
Above-market leases 150,829   150,829   164,040
Deferred tax assets 30,834   30,834   29,006
Deferred compensation plan assets 54,441   54,441   52,221
Distributions in excess of co-venture obligation 0   0   31,150
Other assets 67,652   67,652   66,990
Deferred charges and other assets, gross 640,880   640,880   710,616
Less accumulated amortization (237,122)   (237,122)   (261,426)
Deferred charges and other assets, net 403,758   403,758   449,190
In-place lease values, leasing commissions and legal costs          
Finite-Lived Intangible Assets [Line Items]          
Accumulated amortization for intangible assets 69,192   69,192   $ 74,507
Amortization expense for intangible assets $ 3,552 $ 5,545 $ 7,390 $ 11,549