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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Stock-Based Compensation  
Summary of activity under the entity's stock option plans

The following table summarizes activity under our stock option plans (shares in thousands):

 

 

 

 

 

 

 

 

 

Year Ended

 

 

 

December 31,

 

 

 

2016

 

 

    

 

    

Weighted-

 

 

 

 

 

Average

 

Stock Options

    

Shares

    

Exercise Price

 

Outstanding at beginning of year

 
724

 

$
14.69

 

Granted

 
102

 

$
30.36

 

Exercised

 
(112)

 

$
14.11

 

Forfeited

 

 —

 

$

 —

 

Expired

 

 —

 

$

 —

 

Outstanding at end of year

 
714

 

$
17.01

 

Options exercisable at end of year

 
473

 

 

 

 

 

Summary information about stock options outstanding

The following table summarizes information about stock options outstanding at December 31, 2016 (shares in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Options Outstanding

 

Options Exercisable

 

 

    

 

    

Weighted-

    

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

 

 

 

 

Number

 

Remaining

 

Weighted-

 

Number

 

Weighted-

 

 

 

Outstanding at

 

Contractual

 

Average

 

Exercisable at

 

Average

 

Range of Exercise Prices

    

12/31/2016

    

Life

    

Exercise Price

    

12/31/2016

    

Exercise Price

 

$11.00 - $15.00

 
361

 
4.63

 

$
12.64

 
361

 

$
12.64

 

$15.01 - $20.00

 
251

 
7.72

 

$
17.89

 
112

 

$
17.30

 

$20.01 - $30.36

 
102

 
9.23

 

$
30.36

 

 —

 

$

 —

 

$11.00 - $30.36

 
714

 
6.37

 

$
17.01

 
473

 

$
13.74

 

 

Schedule of fair values and the assumptions used for the grants

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31,

 

 

    

2016

    

2015

    

2014

 

Weighted-average fair value per share of options granted

 

$
9.94

 

$
6.33

 

$
6.24

 

Fair value assumptions:

 

 

 

 

 

 

 

 

 

 

Expected dividend yield

 

 
0.97%

 

 
1.51%

 

 
1.34%

 

Expected stock price volatility

 

 
37.9%

 

 
38.4%

 

 
45.2%

 

Risk-free interest rate

 

 
1.41%

 

 
1.50%

 

 
1.91%

 

Expected term

 

 

5.3 years

 

 

5.6 years

 

 

5.6 years

 

 

Summary of information about nonvested stock option awards and changes

The following table summarizes information about nonvested stock option awards as of December 31, 2016 and changes for the year ended December 31, 2016 (shares in thousands):

 

 

 

 

 

 

 

 

    

 

    

Weighted-Average

 

 

 

 

 

Grant Date

 

Stock Options

    

Shares

    

Fair Value

 

Nonvested at December 31, 2015

 
287

 

$
6.07

 

Granted

 
102

 

$
9.94

 

Vested

 
(148)

 

$
5.85

 

Forfeited

 

 —

 

 

 —

 

Nonvested at December 31, 2016

 
241

 

$
7.83

 

 

Summary of activity under the entity's restricted stock plans

The following table summarizes activity under our restricted stock plans (shares in thousands):

 

 

 

 

 

 

 

 

 

Year Ended

 

 

 

December 31,

 

 

 

2016

 

 

 

 

 

Weighted

 

 

 

 

 

Average Grant

 

Restricted Stock and Restricted Stock Units

    

Shares

    

Date Fair Value

 

Unvested at beginning of year

 
149

 

$
17.48

 

Granted

 
85

 

$
30.25

 

Vested

 
(108)

 

$
20.61

 

Forfeited

 

 —

 

$

 —

 

Unvested at end of year

 
126

 

$
23.41