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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of the Company’s stock option activity as of December 31, 2018, and changes during the year then ended, is presented below:
 
Number of
Shares
 
Weighted Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2017
65,766

 
$
16.27

 
 
 
 
Exercised
(10,000
)
 
22.17

 
 
 
 
Outstanding at December 31, 2018
55,766

 
$
15.21

 
1.13
 
$
462

Exercisable as of December 31, 2018
55,766

 
$
15.21

 
1.13
 
$
462

A summary of the Company’s performance stock option activity as of December 31, 2018, and changes during the year then ended, is presented below:
 
Number of
Shares
 
Weighted Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2017
266,522

 
$
31.43

 
 
 
 
Exercised
(16,648
)
 
30.95

 
 
 
 
Cancelled/forfeited
(33,292
)
 
30.95

 
 
 
 
Outstanding at December 31, 2018
216,582

 
$
31.54

 
4.26
 
$
—

Vested and expected to vest as of December 31, 2018
211,807

 
$
31.55

 
4.24
 
$
—

Exercisable as of December 31, 2018
72,198

 
$
31.54

 
4.26
 
$
—
Summary of Restricted Stock Units
A summary of the status of the Company’s stock awards as of December 31, 2018, and changes during the year then ended, is presented below:
 
Non-Vested
Shares (1)
 
Weighted Average
Grant Date
Fair Value
Non-vested at December 31, 2017
805,757

 
$
30.98

Awarded
519,724

 
$
38.52

Vested
(219,443
)
 
$
32.97

Cancelled
(246,106
)
 
$
33.09

Non-vested at December 31, 2018
859,932

 
$
34.43

________________________
(1)
Certain of the Company’s stock awards have a vesting matrix under which the stock awards can vest at a maximum level that is 200% of the shares that would vest for achieving the performance goals at target. The number of shares presented is based on achieving the performance goals at target levels as defined in the stock award agreements. As of December 31, 2018 and 2017, the maximum number of non-vested performance shares that could vest under the provisions of the agreements was 1,218,359 and 1,038,272, respectively.