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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)
12 Months Ended
Dec. 31, 2015
Summary of Stock Option Activity

The following is a summary of stock option activity under the 2014 Plan and the 2001 Plan as of and for the year ended December 31, 2015:

 

     Options      Weighted-
Average
Exercise
Price
     Weighted-
Average
Remaining
Contractual
Term
(in years)
     Aggregate
Intrinsic
Value
 

Options outstanding at December 31, 2014

     241,450       $ 73.62         

Granted

     153,250         123.59         

Exercised

     (114,616      65.65         

Forfeited

     (22,750      118.50         
  

 

 

    

 

 

       

Options outstanding at December 31, 2015

     257,334       $ 102.96         3.36       $ 4,494   
  

 

 

    

 

 

    

 

 

    

 

 

 

Options exercisable at December 31, 2015

     33,834       $ 73.89         1.53       $ 1,491   
  

 

 

    

 

 

    

 

 

    

 

 

 
Summary of Non-Vested Restricted Stock Activity

The following is a summary of non-vested restricted stock activity as of and for the year ended December 31, 2015:

 

     Shares      Weighted-
Average
Grant Date
Fair Value
 

Non-vested restricted stock outstanding at December 31, 2014

     2,643,717       $ 45.21   

Granted

     200,479         114.55   

Vested

     (20,000      49.36   

Forfeited

     (5,000      110.36   
  

 

 

    

 

 

 

Non-vested restricted stock outstanding at December 31, 2015

     2,819,196       $ 49.99   
  

 

 

    

 

 

 
Valuation Assumptions Used for Stock Option Awards

The following table presents the weighted-average assumptions used for stock options granted:

 

Years Ended December 31,

   2015     2014     2013  

Expected term in years

     4.25        4.25        4.25   

Risk-free interest rate

     1.25     1.35     0.82

Expected volatility

     20.96     22.07     24.56

Expected dividend yield

     2.29     1.69     2.20

Grant date fair value

   $ 17.17      $ 15.75      $ 13.33   
Share-Based Compensation Expense

The following table provides information on share-based compensation expense:

 

Years Ended December 31,

   2015      2014      2013  

Stock options

   $ 952       $ 801       $ 884   

Non-vested restricted stock

     11,644         10,672         9,083   
  

 

 

    

 

 

    

 

 

 

Share-based compensation expense

   $ 12,596       $ 11,473       $ 9,967