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Derivative Instruments and Hedging Activities: (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Derivative Instruments and Hedging Activities:      
Other comprehensive income related to marking-to-market of interest rate agreements $ 3,237 $ 22,160 $ 28,028
Interest rate swap agreement
     
Derivatives      
Fair Value   3,237  
Westside Pavilion | Interest rate cap agreement
     
Derivatives      
Notional Amount of outstanding derivatives $ 175,000    
Interest Rate of outstanding derivative (as a percent) 5.50%