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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option Grant Fair Value Assumptions

The fair value of option grants are 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:

 

     Year Ended December 31,  
     2017     2016     2015  

Expected volatility

     43.95     46.04     47.15

Expected dividends

     0.00     0.00     0.00

Expected term (in years)

     5.96       5.80       6.15  

Risk-free rate

     2.09     1.32     1.62

 

Summary of Company's Stock Option Plan Activity

The following table summarizes the stock option activity for the year ended December 31, 2017:

 

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, 2017

    1,166     $ 14.66      

Granted

    116       19.99      

Exercised

    (289     7.35      

Forfeited

    (35     18.30      

Expired

    —         —        
 

 

 

   

 

 

     

Options outstanding at December 31, 2017

    958     $ 17.39       7.1     $ 8,747  
 

 

 

   

 

 

   

 

 

   

 

 

 

Options exercisable at December 31, 2017

    771     $ 16.99       6.8     $ 7,351  
 

 

 

   

 

 

   

 

 

   

 

 

 

Available for grant at December 31, 2017

    1,275        
 

 

 

       

 

Summary of Additional Stock Option Information

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

 

     Year Ended December 31,  
In thousands, except per share amounts    2017      2016      2015  

Weighted-average grant date fair value per share

   $ 8.90      $ 7.74      $ 7.13  

Intrinsic value of options exercised

   $ 4,981      $ 1,397      $ 1,524  

Fair value of stock options that vested

   $ 3,004      $ 2,131      $ 1,207  

 

Summary of RSU Activity
The following table summarizes RSU activity during the year ended December 31, 2017:

 

In thousands, except per unit amounts

   Units      Weighted-Average
Grant Date
Fair Value Per Unit
 

Non-vested units at January 1, 2017

     164      $ 16.07  

Granted

     85        19.99  

Vested

     —          —    

Forfeited

     (48      17.69  
  

 

 

    

 

 

 

Non-vested units at December 31, 2017

     201      $ 17.33  
  

 

 

    

 

 

 

 

Summary of Additional RSU Information

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

 

     Year Ended December 31,  
     2017      2016      2015  

Weighted-average grant date fair value per unit

   $ 19.99      $ 17.02      $ 14.89  

 

Summary of CSPU Activity

The following table summarizes CSPU activity during the year ended December 31, 2017:

 

In thousands, except per unit amounts    Units      Weighted-Average
Grant Date
Fair Value Per Unit
 

Non-vested units at January 1, 2017

     2,641      $ 1.00  

Granted

     1,686        1.00  

Vested

     —        —  

Forfeited

     (843      1.00  
  

 

 

    

 

 

 

Non-vested units at December 31, 2017

     3,484      $ 1.00  
  

 

 

    

 

 

 

 

Summary of Restricted Stock Activity

The following table summarizes restricted stock activity during the year ended December 31, 2017:

 

In thousands, except per share amounts

   Shares      Weighted-Average
Grant Date
Fair Value Per Share
 

Non-vested shares at January 1, 2017

     39      $ 16.46  

Granted

     83        18.38  

Vested

     (60      16.30  

Forfeited

     (9      18.25  
  

 

 

    

 

 

 

Non-vested shares at December 31, 2017

     53      $ 19.36  
  

 

 

    

 

 

 

 

Summary of Additional Restricted Stock Information

The following table provides additional restricted stock information.

 

     Year Ended December 31,  
In thousands, except per share amounts    2017      2016      2015  

Weighted-average grant date fair value per share

   $ 18.38      $ 16.37      $ 15.36  

Fair value of restricted stock awards that vested

   $ 983      $ 347      $ 2,198