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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2013
SHARE-BASED COMPENSATION.  
Schedule of share-based compensation expense

 

 

 
   Year Ended December 31,  
 
   2013   2012   2011  
 
   (in thousands)
  

Direct cost of operating revenue

   $ 660   $ 201   $ 309  

Selling, general and administrative

     9,348     6,518     7,060  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Pre-tax share-based compensation expense

     10,008     6,719     7,369  

Income tax benefit

     (4,135 )   (2,908 )   (3,190 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total share-based compensation expense, net of tax

   $ 5,873   $ 3,811   $ 4,179  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

        
Schedule of weighted-average assumptions used and the weighted-average fair value per option granted

 

 

 
   Year Ended December 31,  
 
   2012   2011  

Expected life of stock option in years

     6.8     6.6  

Expected volatility

     39 %   30 %

Risk-free interest rate

     1.1 %   2.5 %

Dividend yield

     2.3 %   1.1 %

Weighted average grant-date fair value

   $ 3.51   $ 4.49  

        
Summary of option activity

   A summary of option activity during the year ended December 31, 2013 is presented below (shares and aggregate intrinsic value in thousands):

 
   Shares   Weighted
Average
Exercise Price		   Weighted
Average
Contractual
Term		   Aggregate
Intrinsic Value		  

Outstanding, beginning of period

     5,795   $ 12.23              

Granted

     —     —              

Exercised

     (1,924 )   10.07              

Forfeited and expired

     (46 )   14.16              
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding, end of period

     3,825   $ 13.32     3.88   $ 11,290  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Options vested and expected to vest, end of period

     3,783   $ 13.33     3.83   $ 11,128  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Options exercisable, end of period

     3,380   $ 13.38     3.41   $ 9,821  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

        
Summary of information about stock options outstanding

The following table summarizes information about stock options outstanding as of December 31, 2013 (in thousands, except contractual life and price data):

 
   Options Outstanding    
    
  
 
   Options Exercisable  
 
    
   Weighted-
Average
Remaining
Contractual Life
(in years)		    
  
Range of
Exercise Prices
  Number
Outstanding		   Weighted-
Average
Exercise
Price		   Number
Exercisable		   Weighted-
Average
Exercise
Price		  

$8.13 to $10.39

     952     2.51   $ 10.05     952   $ 10.05  

$10.40 to $12.64

     605     4.99     11.72     355     12.08  

$12.65 to $15.15

     1,228     4.19     13.89     1,104     13.84  

$15.16 to $18.15

     1,040     4.10     16.52     969     16.56  
                             
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     3,825     3.88     13.32     3,380     13.38  
                             
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                             
Summary of nonvested share activity

A summary of nonvested share activity during the year ended December 31, 2013 is presented below (shares in thousands):

 
   Shares   Weighted
Average Grant
Date Fair
Value		  

Nonvested, beginning of period

     430   $ 11.85  

Granted

     528     12.90  

Vested

     (594 )   12.40  

Forfeited/Canceled

     —     —  
           
​ ​ ​ ​ ​ ​ ​ ​

Outstanding, end of period

     364   $ 12.48  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​