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Deferred Charges and Other Assets, net: (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Leasing $ 248,709 $ 239,955  
Financing 45,874 47,171  
Intangible assets:      
In-place lease values 196,969 298,825  
Leasing commissions and legal costs 52,000 72,432  
Above-market leases 220,847 250,810  
Deferred tax assets 38,847 35,625  
Deferred compensation plan assets 37,341 35,194  
Other assets 70,070 66,246  
Deferred charges and other assets, gross 910,657 1,046,258  
Less accumulated amortization (323,374) (287,197)  
Deferred charges and other assets, net 587,283 759,061  
Accumulated amortization for in-place lease values, leasing commissions and legal costs 109,453 103,361  
Amortization expense for intangible assets $ 69,460 $ 52,668 $ 53,139