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Deferred Charges And Other Assets, net: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred Charges And Other Assets, net:      
Leasing $ 281,340 $ 189,853  
Financing 40,638 57,564  
Intangible assets:      
In-place lease values 121,320 99,328  
Leasing commissions and legal costs 32,242 29,088  
Other assets 198,596 152,167  
Deferred charges and other assets, gross 674,136 528,000  
Less accumulated amortization (190,373) (211,031)  
Deferred charges and other assets, net 483,763 316,969  
Accumulated amortization for intangible assets 56,946 60,859  
Amortization expense for intangible assets 15,492 14,886 19,815
Estimated amortization of intangible assets for the next five years and thereafter      
2012 22,431    
2013 15,399    
2014 10,787    
2015 7,841    
2016 6,037    
Thereafter 34,121    
Total $ 96,616