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Deferred Charges and Other Assets, net: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Deferred Charges and Other Assets, net:          
Leasing $ 204,554   $ 204,554   $ 281,340
Financing 34,307   34,307   40,638
Intangible assets:          
In-place lease values 104,330   104,330   121,320
Leasing commissions and legal costs 28,468   28,468   32,242
Other assets 196,446   196,446   198,596
Deferred charges and other assets, gross 568,105   568,105   674,136
Less accumulated amortization (180,987)   (180,987)   (190,373)
Deferred charges and other assets, net 387,118   387,118   483,763
Accumulated amortization for intangible assets 50,068   50,068   56,946
Amortization expense for intangible assets $ 6,553 $ 3,325 $ 16,205 $ 6,983