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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Deferred Charges and Other Assets, net:          
Leasing $ 210,286   $ 210,286   $ 281,340
Financing 32,784   32,784   40,638
Intangible assets:          
In-place lease values 102,904   102,904   121,320
Leasing commissions and legal costs 28,150   28,150   32,242
Other assets 178,495   178,495   198,596
Deferred charges and other assets, gross 552,619   552,619   674,136
Less accumulated amortization (193,391)   (193,391)   (190,373)
Deferred charges and other assets, net 359,228   359,228   483,763
Accumulated amortization for intangible assets 54,648   54,648   56,946
Amortization expense for intangible assets $ 6,323 $ 4,171 $ 22,529 $ 11,154