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Deferred Charges and Other Assets, net: (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Allocated values of leases    
Less accumulated amortization $ (54,648) $ (56,946)
Above-Market Leases
   
Allocated values of leases    
Original allocated value 98,153 97,297
Less accumulated amortization (44,944) (39,057)
Allocated value net 53,209 58,240
Below-Market Leases
   
Allocated values of leases    
Original allocated value (136,166) (156,778)
Less accumulated amortization 80,417 91,400
Allocated value net $ (55,749) $ (65,378)