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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
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

    2015        2014        2013   

Balance at January 1,

    888,942        1,001,814        847,679   

Granted

    164,666        178,882        315,196   

Forfeited

    (92,183     (47,379     (47,831

Shares delivered

    (286,902     (244,375     (113,230

Balance at December 31,

    674,523        888,942        1,001,814   
Compensation Expense for Stock Option Activity
                                                                                2015        2014      2013   

Compensation expense

  $ 1,758      $ 2,652      $ 2,882   
Stock Only Stock Appreciation Rights (SOSARs) [Member]  
Summary of Stock Option Activity

The following table sets forth information related to outstanding SOSARS:

 

     2015      2014      2013  

SOSARS

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

Outstanding at January 1,

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

Granted

     423,590        24.62         281,881        29.78         368,687        18.51   

Exercised

     (70,347     14.12         (364,465     13.99         (435,562     12.63   

Canceled / forfeited

     (18,208     25.41         (29,842     19.36         (77,446     16.28   

Outstanding at December 31,

     2,199,742      $ 17.82         1,864,707      $ 16.20         1,977,133      $ 13.91   

Exercisable at December 31,

     1,504,599        14.48         1,285,998        12.94         1,330,816        12.58   

Vested and expected to vest

     2,178,708           1,754,295           1,863,244     
 

SOSAR Grants

              

Weighted average grant date fair value per share

   $ 7.46         $ 9.81         $ 5.74     

Aggregate grant date fair value (in thousands)

   $ 3,134         $ 2,764         $ 2,103     

Black-Scholes assumptions

              

Dividend yield

     1.94        1.48        2.16  

Risk free rate of return

     1.64        1.74        1.01  

Volatility

     36.38        37.59        39.58  

Expected life

     6 yrs           6 yrs           6 yrs     

Compensation expense (in thousands)

   $ 2,645               $ 2,086               $ 1,591