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Deferred Charges and Other Assets, net: (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Leasing $ 224,302   $ 248,709
Intangible assets:      
In-place lease values 159,057   196,969
Leasing commissions and legal costs 37,556   52,000
Above-market leases 210,733   220,847
Deferred tax assets 37,591   38,847
Deferred compensation plan assets 37,818   37,341
Other assets 53,363   70,070
Deferred charges and other assets, gross 760,420   864,783
Less accumulated amortization (255,256)   (300,492)
Deferred charges and other assets, net 505,164   564,291
Accumulated amortization for intangible assets 84,501   $ 109,453
Amortization expense for intangible assets $ 8,847 $ 21,678