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Deferred Charges and Other Assets, net: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Leasing $ 223,038 $ 234,498  
Finance 51,695 42,868  
Intangible assets:      
In-place lease values 205,651 175,735  
Leasing commissions and legal costs 50,594 46,419  
Above-market leases 118,770 118,033  
Deferred tax assets 31,356 33,414  
Deferred compensation plan assets 30,932 24,670  
Acquisition deposit 0 30,000  
Other assets 65,793 72,811  
Deferred charges and other assets, gross 777,829 778,448  
Less accumulated amortization(2) (244,771) (213,318)  
Deferred charges and other assets, net 533,058 565,130  
Accumulated amortization for in-place lease values, leasing commissions and legal costs 89,141 62,792  
Amortization expense for intangible assets $ 53,139 $ 32,456 $ 13,222