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Share-Based Employee Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Shares Authorized, Available for Future Grant and Outstanding Under Each Plans
The following table presents shares authorized, available for future grant and outstanding under each of the Company’s plans as of December 31, 2018:
 
Authorized
 
Available
 
Outstanding(1)
 
(In thousands)
2004 Incentive Plan
33,000

 
9,706

 
3,004

2013 Directors Plan
1,000

 
696

 
51

Total
34,000

 
10,402

 
3,055

 

(1)
Includes 6,000 shares of accrued incremental dividend equivalent rights on outstanding shares underlying restricted stock units granted under the 2004 Incentive Plan and 2013 Directors Plan.
Stock Option Activities
The following table summarizes the Company’s stock option activities for the year ended December 31, 2018 (in thousands, except price per share and contractual term):
Options
Number of
Shares
 
Weighted-
Average
Exercise Price
Per Share
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2018
980

 
$
7.15

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(232
)
 
$
7.05

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Expired
(57
)
 
$
14.92

 
 
 
 
Outstanding at December 31, 2018
691

 
$
6.54

 
4.05
 
$
6,053

Vested and expected to vest in the future at December 31, 2018
691

 
$
6.54

 
4.05
 
$
6,053

Exercisable at December 31, 2018
691

 
$
6.54

 
4.05
 
$
6,053
Roll-Forward of Activity for Restricted Stock Units
The table below is a roll-forward of the activity for restricted stock units during the 12 months ended December 31, 2018 (in thousands, except fair value amounts):
Restricted Stock Units
Units
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at January 1, 2018
1,276

 
$
10.09

Granted
424

 
15.30

Vested
(451
)
 
9.28

Forfeited
(10
)
 
11.32

Nonvested at December 31, 20181
1,239

 
$
12.16


 
(1)
Excludes 6,000 shares of accrued incremental dividend equivalent rights on outstanding shares underlying restricted stock units granted under the 2004 Incentive Plan and 2013 Directors Plan.
Roll-Forward of Activity for Performance Share Units
The table below is a roll-forward of the activity for performance share units during the 12 months ended December 31, 2018 (in thousands, except fair value amounts):
Performance Share Units
Units
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at January 1, 20181
1,433

 
$
9.05

Granted
307

 
14.80

Vested
(606
)
 
7.87

Forfeited
(15
)
 
10.68

Nonvested at December 31, 2018
1,119

 
$
11.10


 
(1)
Nonvested performance share units as of January 1, 2018, are comprised of 1,292,000 shares at the target award rate adjusted for shares earned by participants at 130.2% for awards granted in 2015
Summary of Total Number of Stock Appreciation Rights Granted
 
 
 
 
Share-Based Compensation Including Expense for Phantom Stock Units and Cash Settled Stock Appreciation Rights Granted to Employees
The table below summarizes the amounts recognized in the financial statements for the years ended December 31, 2018, 2017 and 2016 for share-based compensation, including expense for stock options, restricted stock units, performance share units and cash settled stock appreciation rights (in thousands):
 
2018
 
2017
 
2016
Cost of sales
$
976

 
$
907

 
$
704

Operating expenses
12,554

 
11,708

 
8,581

Total cost of employee share-based compensation included in income before income tax
$
13,530

 
$
12,615

 
$
9,285