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Deferred Charges and Other Assets, net: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Deferred Charges and Other Assets, net:      
Leasing $ 232,555   $ 234,498
Financing 47,444   42,868
Intangible assets:      
In-place lease values 204,046   175,735
Leasing commissions and legal costs 50,499   46,419
Above-market leases 129,256   118,033
Deferred tax assets 33,843   33,414
Deferred compensation plan assets 25,526   24,670
Acquisition deposit     30,000
Other assets 61,935   72,811
Deferred charges and other assets, gross 785,104   778,448
Less accumulated amortization (205,802)   (213,318)
Deferred charges and other assets, net 579,302   565,130
Accumulated amortization for in-place lease values, leasing commissions and legal costs 64,047   62,792
Amortization expense for intangible assets $ 13,893 $ 9,652