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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Stock-Based Compensation  
Schedule of stock option activity and related information

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   Options   Weighted
Average
Exercise
Price		   Weighted
Average
Intrinsic
Value		   Options   Weighted
Average
Exercise
Price		   Options   Weighted
Average
Exercise
Price		  
 
   (Options in thousands)
  

Outstanding at beginning of year

     1,064   $ 33.37           1,272   $ 30.43     1,303   $ 29.00  

Granted

     379     54.78           415     37.67     295     29.39  

Cancelled/Forfeitures

     (53 )   36.97           (33 )   31.18     (78 )   30.38  

Exercised

     (361 )   31.73           (590 )   30.19     (248 )   21.68  
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at end of year

     1,029   $ 41.66   $ 20.21     1,064   $ 33.37     1,272   $ 30.43  
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                       

Exercisable at end of year

     249   $ 32.35   $ 29.52     360   $ 30.91     745   $ 30.61  
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                       

        
Schedule of information about options outstanding

The following table summarizes information about options outstanding at December 31, 2013:

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

$26.34–$33.65

     305     3.97   $ 30.18     174   $ 30.16  

$35.20–$35.70

     10     3.80     35.35     10     35.35  

$37.41–$37.41

     301     6.05     37.41     55     37.41  

$40.17–$57.95

     413     7.93     53.40     10     40.17  
                             
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     1,029     6.17   $ 41.66     249   $ 32.35  
                             
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                             

        
Schedule of weighted average assumptions used to estimate the grant-date fair value of share issued under the 2004 Stock Incentive Plan

 

 
   Years Ended December 31,  
 
   2013   2012   2011  

Expected life (years)

     6.0     6.0     6.0  

Expected stock price volatility

     40.3 %   41.2 %   40.9 %

Expected dividend yield

     1.0 %   1.2 %   1.5 %

Risk-free interest rate

     1.7 %   0.9 %   1.6 %

        
Schedule of unvested restricted stock and deferred shares activity and related information

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   Shares   Weighted
Average
Grant Date
Fair Value		   Shares   Weighted
Average
Grant Date
Fair Value		   Shares   Weighted
Average
Grant Date
Fair Value		  
 
   (Shares in thousands)
  

Unvested at beginning of year

     237   $ 35.45     153   $ 30.33     162   $ 31.39  

Granted

     142     54.80     170     37.62     115     29.51  

Cancelled/Forfeitures

     (16 )   37.44     (8 )   30.66     (14 )   31.12  

Vested

     (103 )   35.25     (78 )   30.61     (110 )   30.94  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Unvested at end of year

     260   $ 45.58     237   $ 35.45     153   $ 30.33  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                 

        
Schedule of the Company's RSU activity and related information

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   RSUs   Weighted
Average
Purchase
Price		   Weighted
Average
Intrinsic
Value		   RSUs   Weighted
Average
Purchase
Price		   RSUs   Weighted
Average
Purchase
Price		  
 
   (RSU's in thousands)
  

Outstanding at beginning of period

     196   $ 22.88           392   $ 18.74     361   $ 16.92  

Granted

     45     31.63           64           99     25.15  

Cancelled/Forfeitures

     (14 )   28.35           (110 )         (10 )   20.92  

Settled

     (95 )   19.19           (150 )         (58 )   18.01  
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at end of period

     132   $ 27.46   $ 34.41     196   $ 22.88     392   $ 18.74  
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                       

Vested at end of period

     42   $ 25.30   $ 36.57     81   $ 20.36     157   $ 15.57  
                                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                       

        
Schedule of information about RSUs outstanding

 

 
   RSUs Outstanding   RSUs Vested  
Range of Purchase Prices
  Number
Outstanding		   Weighted Average
Purchase
Price		   Number
Vested		   Weighted Average
Purchase
Price		  
 
   (RSUs in thousands)
  

$13.25–$19.87

     2   $ 16.21     2   $ 16.21  

$25.15–$26.51

     91     25.88     40     25.69  

$31.63–$31.63

     39     31.63     —     —  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

     132   $ 27.46     42   $ 25.30  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

        
Schedule of weighted average assumptions used to estimate the grant-date fair value of restricted stock units

 

 
   Years Ended December 31,  
 
   2013   2012   2011  

Expected life (years)

     3.0     3.0     3.0  

Expected stock price volatility

     34.1 %   38.3 %   44.9 %

Expected dividend yield

     0.9 %   1.1 %   1.2 %

Risk-free interest rate

     0.4 %   0.4 %   1.2 %