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Share and Unit-Based Plans: (Tables)
 9 Months Ended
Sep. 30, 2012
Share and Unit-Based Plans:  
Compensation cost under the share and unit-based plans

 

 

 
   For the Three Months
Ended September 30, 		  For the Nine Months
Ended September 30, 		 
 
   2012   2011   2012   2011  

LTIP Units

   $ 2,778   $ 2,239   $ 6,646   $ 6,716  

Stock awards

     125     85     345     663  

Stock units

     383     891     2,991     6,634  

Stock options

     18     —     18     —  

SARs

     210     3     291     626  

Phantom stock units

     211     243     721     726  
                   

 

   $ 3,725   $ 3,461   $ 11,012   $ 15,365  
                   

        
Summary of activity of non-vested LTIP Units, stock awards, phantom stock and stock units

 

 

 
   LTIP Units   Stock Awards   Phantom Stock   Stock Units  
 
   Units   Value(1)   Shares   Value(1)   Units   Value(1)   Units   Value(1)  

Balance January 1, 2012

     190,000   $ 43.30     21,130   $ 40.68     15,745   $ 34.84     576,340   $ 11.71  

Granted(2)

     315,000     40.53     9,639     54.43     5,930     57.50     72,322     54.43  

Vested(2)

     (305,000 )   44.85     (9,845 )   35.69     (16,844 )   45.81     (533,985 )   15.24  

Forfeited

     —     —     —     —     (1,462 )   33.74     —     —  
                                           

Balance at September 30, 2012

     200,000   $ 38.63     20,924   $ 49.36     3,369   $ 34.84     114,677   $ 52.19  
                                           
(1)
Value represents the weighted-average grant date fair value.

(2)
On February 7, 2012, the compensation committee determined that the LTIP Units granted under the LTIP on February 28, 2011 had vested at the 150% level based on the Company's percentile ranking in terms of Total Return per common stock share to the Total Return of a group of peer REITs during the period of February 1, 2011 to January 31, 2012. As a result, the compensation committee granted an additional 95,000 LTIP Units, which vested as of January 31, 2012.
Summary of activity of SARs and stock options outstanding

 

 

 
   SARs   Stock Options  
 
   Shares   Value(1)   Shares   Value(1)  

Balance January 1, 2012

     1,156,985   $ 56.55     13,500   $ 30.08  

Granted

     39,932     59.57     10,068     59.57  

Exercised

     (32,732 )   56.63     (8,100 )   28.47  

Forfeited

     —     —     —     —  
                       

Balance at September 30, 2012

     1,164,185   $ 56.65     15,468   $ 50.12  
                       
(1)
Value represents the weighted-average exercise price.