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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Stock Only Stock Appreciation Rights (SOSARs) [Member]  
Summary of Stock Option Activity
The following table sets forth information related to outstanding SOSARS:

 

     2014      2013      2012  

SOSARS

     Shares       
 
Wtd Avg
Exercise Price
  
  
     Shares       
 
Wtd Avg
Exercise Price
  
  
     Shares       
 
Wtd Avg
Exercise Price
  
  

Outstanding at January 1,

     1,977,133      $ 13.91         2,121,454      $ 12.93         2,298,288      $ 12.35   

Granted

     281,881        29.78         368,687        18.51         364,114        15.58   

Exercised

     (364,465     13.99         (435,562     12.63         (500,074     12.06   

Canceled / forfeited

     (29,842     19.36         (77,446     16.28         (40,874     14.31   

Outstanding at December 31,

     1,864,707      $ 16.20         1,977,133      $ 13.91         2,121,454      $ 12.93   

Exercisable at December 31,

     1,285,998        12.94         1,330,816        12.58         1,469,537        12.30   

Vested and expected to vest

     1,754,295           1,863,244           2,055,599     
 

SOSAR Grants

              

Weighted average grant date fair value per share

   $ 9.81         $ 5.74         $ 4.94     

Aggregate grant date fair value (in thousands)

   $ 2,764         $ 2,103         $ 1,797     

Black-Scholes assumptions

              

Dividend yield

     1.48        2.16        2.31  

Risk free rate of return

     1.74        1.01        1.02  

Volatility

     37.59        39.58        41.48  

Expected life

     6 yrs           6 yrs           6 yrs     

Compensation expense (in thousands)

   $ 2,086               $ 1,591               $ 1,448           

 

Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]  
Summary of Stock Option Activity

The following table summarizes RSU and PSA activity during the past three years:

 

Units

    2014        2013        2012   

Balance at January 1,

    1,001,814        847,679        788,088   

Granted

    178,882        315,196        209,021   

Forfeited

    (47,379     (47,831     (52,800

Shares delivered

    (244,375     (113,230     (96,630

Balance at December 31,

    888,942        1,001,814        847,679   
Compensation Expense for Stock Option Activity
      2014        2013        2012   

Compensation expense

  $ 2,652      $ 2,882      $ 2,576