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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock-Based Compensation Expense
The following table details total stock-based compensation expense for the years ended December 31, 2017, 2016 and 2015, included in the consolidated statements of operations:
(In thousands)
2017
 
2016
 
2015
Costs of sales
$
1,750

 
$
1,396

 
$
1,447

Operating expenses
5,416

 
3,970

 
3,933

Pre-tax stock-based compensation expense
7,166

 
5,366

 
5,380

Less: income tax effect
(2,795
)
 
(2,093
)
 
(2,098
)
Net (after tax) stock-based compensation expense
$
4,371

 
$
3,273

 
$
3,282
Restricted stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Activity Under Restricted Stock Plans
A summary of restricted stock activity under the Plans during the years ended December 31, 2017, 2016 and 2015 is as follows:
 
Shares
 
Weighted-Average
Grant-Date
Fair Value
Nonvested stock outstanding at January 1, 2015
160,216

 
$
59.14

Granted
60,850

 
51.85

Performance share awards converted to restricted stock
45,844

 
60.28

Vested
(62,628
)
 
59.30

Forfeited
(12,885
)
 
58.06

Nonvested stock outstanding at December 31, 2015
191,397

 
$
57.12

Granted
86,984

 
52.21

Vested
(93,496
)
 
57.48

Nonvested stock outstanding at December 31, 2016
184,885

 
$
54.63

Granted
225,954

 
32.79

Vested
(101,644
)
 
55.58

Nonvested stock outstanding at December 31, 2017
309,195

 
$
38.36
Performance shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Activity Under Restricted Stock Plans
A summary of performance share award activity under the 2014 Incentive Plan for the years ended December 31, 2017, 2016 and 2015, is as follows, based on the target award amounts set forth in the performance share award agreements:
 
Shares
 
Weighted-Average
Grant-Date
Fair Value
Performance share awards outstanding at January 1, 2015
46,541

 
$
60.28

Granted
52,364

 
49.29

Forfeited or unearned
(3,590
)
 
51.42

Performance share awards converted to restricted stock
(45,844
)
 
60.28

Performance share awards outstanding at December 31, 2015
49,471

 
$
49.29

Granted
77,594

 
49.64

Forfeited or unearned
(49,471
)
 
49.29

Performance share awards converted to restricted stock
—

 
—

Performance share awards outstanding at December 31, 2016
77,594

 
$
49.64

Granted
189,325

 
29.94

Forfeited or unearned
(77,594
)
 
49.64

Performance share awards converted to restricted stock
—

 
—

Performance share awards outstanding at December 31, 2017
189,325

 
$
29.94