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Share and Unit-Based Plans:
 6 Months Ended
Jun. 30, 2013
Share and Unit-Based Plans:  
Share and Unit-Based Plans:

18. Share and Unit-Based Plans:

        On February 15, 2013, the Company granted 332,189 limited partnership units of the Operating Partnership ("LTIP Units") under the Long-Term Incentive Plan to seven executive officers at a weighted average grant date fair value of $49.67 per LTIP Unit. The new grants vest over a service period ending December 31, 2013 based on the percentile ranking of the Company in terms of total return to stockholders (the "Total Return") per share of common stock relative to the Total Return of a group of peer REITs, as measured at the end of the measurement period. Upon the occurrence of specified events and subject to the satisfaction of applicable vesting conditions, LTIP Units (after conversion into OP Units) are ultimately redeemable for common stock of the Company on a one-unit for one-share basis.

        The fair value of the Company's LTIP Units granted in 2013 was estimated on the date of grant using a Monte Carlo Simulation model. The stock price of the Company, along with the stock prices of the group of peer REITs, was assumed to follow the Multivariate Geometric Brownian Motion Process. Multivariate Geometric Brownian Motion Process modeling is commonly used in financial markets, as it allows the modeled quantity (in this case, the stock price) to vary randomly from its current value based on the stock price's expected volatility and current market interest rates. The volatilities of the returns on the stock price of the Company and the peer group REITs were estimated based on a one-year look-back period. The expected growth rate of the stock prices over the derived service period was determined with consideration of the risk free rate as of the grant date.

        The following summarizes the compensation cost under the share and unit-based plans:

 
   For the Three Months
Ended June 30,		   For the Six Months
Ended June 30,		  
 
   2013   2012   2013   2012  

LTIP Units

   $ 4,692   $ 2,321   $ 7,650   $ 3,868  

Stock awards

     122     124     232     220  

Stock units

     667     383     2,491     2,603  

Stock options

     4     —     8     —  

SARs

     —     82     —     82  

Phantom stock units

     246     255     487     509  
                   

 

   $ 5,731   $ 3,165   $ 10,868   $ 7,282  
                   

        The Company capitalized share and unit-based compensation costs of $650 and $452 for the three months ended June 30, 2013 and 2012, respectively, and $2,088 and $1,772 for the six months ended June 30, 2013 and 2012, respectively. Unrecognized compensation costs of share and unit-based plans at June 30, 2013 consisted of $9,487 from LTIP Units, $913 from stock awards, $4,324 from stock units, $68 from stock options and $1,188 from phantom stock units.

        The following table summarizes the activity of the non-vested LTIP Units, stock awards, phantom stock units and stock units:

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

Balance at January 1, 2013

     200,000   $ 38.63     20,924   $ 49.36     —   $ —     114,677   $ 52.19  

Granted

     332,189     49.67     8,963     61.84     28,446     58.92     67,920     62.01  

Vested

     (200,000 )   38.63     (10,886 )   46.70     (8,081 )   60.35     (45,279 )   51.29  

Forfeited

     —     —     —     —     —     —     —     —  
                                           

Balance at June 30, 2013

     332,189   $ 49.67     19,001   $ 56.77     20,365   $ 58.36     137,318   $ 57.24  
                                           
(1)
Value represents the weighted-average grant date fair value.

        The following table summarizes the activity of the SARs and stock options outstanding:

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

Balance at January 1, 2013

     1,164,185   $ 56.66     12,768   $ 54.69  

Granted

     —     —     —     —  

Exercised

     (93,194 )   56.63     —     —  

Forfeited

     —     —     —     —  
                       

Balance at June 30, 2013

     1,070,991   $ 56.66     12,768   $ 54.69  
                       
(1)
Value represents the weighted-average exercise price.