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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option Grant Fair Value Assumptions

The fair value of option grants is estimated on the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions for option grants during the periods indicated below:

 

     Six Months Ended
June 30,
 
     2018     2017  

Expected volatility

     41.63     43.95

Expected dividends

     0.00     0.00

Expected term (in years)

     5.99       5.96  

Risk-free rate

     2.66     2.09
Summary of Company's Stock Option Plan Activity

The following table summarizes the stock option activity for the six months ended June 30, 2018:

 

In thousands, except per share amounts    Number of
Shares
     Weighted-Average
Exercise Price
Per Share
     Weighted-Average
Remaining
Contractual
Life (Years)
     Aggregate
Intrinsic
Value
 

Options outstanding at January 1, 2018

     958      $ 17.39        

Granted

     112        28.25        

Exercised

     (89      16.62        

Forfeited

     —          —          

Expired

     —          —          
  

 

 

    

 

 

       

Options outstanding at June 30, 2018

     981      $ 18.69        7.1      $ 16,007  
  

 

 

    

 

 

    

 

 

    

 

 

 

Options exercisable at June 30, 2018

     703      $ 17.03        6.5      $ 12,639  
  

 

 

    

 

 

    

 

 

    

 

 

 
Summary of Additional Stock Option Information

The following table provides additional stock option information for the periods indicated:

 

     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
In thousands, except per share amounts    2018      2017      2018      2017  

Weighted-average grant date fair value per share

   $ —        $ 8.72      $ 12.39      $ 8.90  

Intrinsic value of options exercised

   $ 574      $ 78      $ 1,604      $ 4,802  

Fair value of stock options that vested

   $ —        $ 258      $ 199      $ 559  
Summary of RSU Activity

The following table summarizes RSU activity during the six months ended June 30, 2018:

 

In thousands, except per unit amounts    Units      Weighted-Average
Grant Date

Fair Value Per Unit
 

Non-vested units at January 1, 2018

     201      $ 17.33  

Granted

     59        28.25  

Vested

     —          —    

Forfeited

     (78      14.92  
  

 

 

    

 

 

 

Non-vested units at June 30, 2018

     182      $ 21.89  
  

 

 

    

 

 

 
Summary of Additional RSU Information

The following table provides additional RSU information for the periods indicated:

 

     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
     2018      2017      2018      2017  

Weighted-average grant date fair value per unit

   $ —        $ —        $ 28.25      $ 19.99  
Summary of CSPU Activity

The following table summarizes CSPU activity during the six months ended June 30, 2018:

 

In thousands, except per unit amounts    Units      Weighted-Average
Grant Date

Fair Value Per Unit
 

Non-vested units at January 1, 2018

     3,484      $ 1.00

Granted

     1,660        1.00  

Vested

     —          —    

Forfeited

     (1,162      1.00  
  

 

 

    

 

 

 

Non-vested units at June 30, 2018

     3,982      $ 1.00  
  

 

 

    

 

 

 
Summary of Restricted Stock Activity

The following table summarizes restricted stock activity during the six months ended June 30, 2018:

 

In thousands, except per share amounts    Shares      Weighted-Average
Grant Date

Fair Value Per Share
 

Non-vested shares at January 1, 2018

     53      $ 19.36  

Granted

     98        24.70  

Vested

     (34      21.09  

Forfeited

     —          —    
  

 

 

    

 

 

 

Non-vested shares at June 30, 2018

     117      $ 23.33  
  

 

 

    

 

 

 
Summary of Additional Restricted Stock Information

The following table provides additional restricted stock information:

 

     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
In thousands, except per share amounts    2018      2017      2018      2017  

Weighted-average grant date fair value per share

   $ 34.39      $ 20.88      $ 24.70      $ 18.38  

Fair value of restricted stock awards that vested

   $ 651      $ 345      $ 711      $ 390