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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Valuation Assumptions
The compensation cost related to these awards is based on the grant date fair value and is expensed over the vesting period (generally one to five years). We use the Black-Scholes-Merton option pricing model to estimate the fair value of stock option awards with the following assumptions for stock option awards issued during the year ended December 31, 2018:

 
Stock Option Valuation Assumptions
Expected dividend
—

Expected volatility
66.55
%
Risk-free interest rate
2.83
%
Expected life of stock option awards (in years)
6.0

Grant-date exercise price
$
31.14

Grant-date fair value
$
19.30
Stock Option Activity
The following table represents stock option award activity for the year ended December 31, 2018:
 
Shares
 
Wtd. Avg.
Exer. Price
Options outstanding, beginning of period
508,730

 
$
26.82

Options granted
201,406

 
$
31.14

Options forfeited
(24,365
)
 
$
26.96

Options canceled
(11,997
)
 
$
26.96

Options exercised
(29,199
)
 
$
24.27

Options outstanding, end of period
644,575

 
$
28.28

Options exercisable, end of period
159,127

 
$
26.84
Restricted Stock Units Activity
The following table represents restricted stock unit activity for the year ended December 31, 2018:
 
Shares
 
Wtd. Avg.
Grant Price
Restricted units outstanding, beginning of period
346,740

 
$
26.99

Restricted stock units granted
126,728

 
$
28.63

Restricted stock units forfeited
(26,100
)
 
$
26.53

Restricted stock units vested
(106,690
)
 
$
26.99

Restricted stock units outstanding, end of period
340,678

 
$
27.64