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Deferred Charges and Other Assets, net: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Leasing $ 226,891   $ 226,891   $ 234,498
Financing 52,038   52,038   42,868
Intangible assets:          
In-place lease values 199,274   199,274   175,735
Leasing commissions and legal costs 50,020   50,020   46,419
Above-market leases 116,717   116,717   118,033
Deferred tax assets 32,020   32,020   33,414
Deferred compensation plan assets 29,126   29,126   24,670
Acquisition deposit 0   0   30,000
Other assets 68,180   68,180   72,811
Deferred charges and other assets, gross 774,266   774,266   778,448
Less accumulated amortization (227,684) [1]   (227,684) [1]   (213,318) [1]
Deferred charges and other assets, net 546,582   546,582   565,130
Accumulated amortization for intangible assets 80,747   80,747   62,792
Amortization expense for intangible assets $ 12,228 $ 6,323 $ 40,611 $ 22,529  
[1] Accumulated amortization includes $80,747 and $62,792 relating to in-place lease values, leasing commissions and legal costs at September 30, 2013 and December 31, 2012, respectively. Amortization expense of in-place lease values, leasing commissions and legal costs was $12,228 and $6,323 for the three months ended September 30, 2013 and 2012, respectively, and $40,611 and $22,529 for the nine months ended September 30, 2013 and 2012, respectively.