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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes stock option activity under the Company’s active stock option plans for the year ended December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contract Life
Outstanding options, beginning of year
940,843

 
$
16.77

 
 
Exercised
(285,887
)
 
18.15

 
 
Forfeited
(12,701
)
 
17.86

 
 
Outstanding options, end of year
642,255

 
$
16.13

 
2.34 years
Outstanding options exercisable, end of year
642,255

 
$
16.13

 
2.34 years
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table presents information regarding the Company’s restricted stock as of December 31, 2017:
 
Number of
Shares
 
Weighted-Average
Measurement Date
Fair Value
Restricted stock, beginning of year
317,055

 
$
26.22

Granted
140,246

 
41.46

Vested
(111,224
)
 
26.14

Forfeited
(53,571
)
 
27.96

Restricted stock, end of year
292,506

 
$
33.24