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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2013
STOCK-BASED COMPENSATION PLANS  
Summary of stock options under all plans

 

 

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

Outstanding at December 31, 2012

     3,159,542   $ 18.96              

Granted

     61,485     53.54              

Exercised

     (1,221,632 )   11.87              

Forfeited

     (112,241 )   28.12              
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     1,887,154   $ 24.14     5.6   $ 64,768  
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         

Exercisable at December 31, 2013

     576,562   $ 21.92     5.4   $ 21,060  
Schedule of assumptions used in valuation related to stock option grants made during the period

 

 

 
   Year ended December 31,
 
   2013   2012   2011

Dividend yield

   1.0%-1.4%   1.2%-1.4%   0.00%

Expected option life

   4.8 years   4.8-5.0 years   4.5-7.0 years

Volatility factor percentage of market price

   35.9%-40.5%   40.0%-40.7%   38.5%-39.2%

Discount rate

   0.7%-1.4%   0.6%-0.9%   1.5%-2.9%
Restricted Stock
  
Stock-based compensation plans  
Summary of stock awards (restricted stock and RSU's) granted under the 2011 Stock Plan and related information

 

 

 
   Restricted
Stock		   Weighted
Average Grant-
Date Fair Value		  

Outstanding at December 31, 2012

     123,941   $ 24.24  

Granted

     18,497     44.15  

Vested

     (13,221 )   39.96  

Forfeited

     (14,236 )   28.05  
             
​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     114,981   $ 25.16  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             
Restricted Stock Units
  
Stock-based compensation plans  
Summary of stock awards (restricted stock and RSU's) granted under the 2011 Stock Plan and related information

 

 

 
   Time Vesting
Restricted
Stock Units		   Weighted
Average Grant-
Date Fair Value		   Performance
Vesting
Restricted
Stock Units		   Weighted
Average Grant-
Date Fair Value		  

Outstanding at December 31, 2012

     171,937   $ 36.16     —   $ —  

Granted

     37,744     53.44     58,226     45.76  

Vested

     (56,637 )   35.85     —     —  

Forfeited

     (11,746 )   37.24     (2,860 )   42.19  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     141,298   $ 40.81     55,366   $ 45.94  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​