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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [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.

Stock Option Activity
The following table represents stock option award activity for the year ended December 31, 2019:
 
Shares
 
Wtd. Avg.
Exer. Price
Options outstanding, beginning of period
644,575

 
$
28.28

Options forfeited
(40,795
)
 
$
27.00

Options canceled in Equity Award Exchange
(201,406
)
 
$
31.14

Options expired
(71,557
)
 
$
23.81

Options outstanding, end of period
330,817

 
$
27.66

Options exercisable, end of period
166,824

 
$
28.94
Restricted Stock Units Activity
The following table provides information regarding restricted stock unit activity for the year ended December 31, 2019:
 
Shares
 
Wtd. Avg.
Grant Price
Restricted units outstanding, beginning of period
340,678

 
$
27.64

Restricted stock units granted
115,957

 
$
20.13

Restricted stock units granted under Equity Award Exchange
99,500

 
$
16.70

Restricted stock canceled under Equity Award Exchange
(24,622
)
 
$
31.14

Restricted stock units forfeited
(59,842
)
 
$
24.13

Restricted stock units vested
(128,988
)
 
$
27.54

Restricted stock units outstanding, end of period
342,683

 
$
22.10