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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Option Activity
Stock option activity for the year ended December 31, 2017 were as follows:
 
 
Number
of Stock Options
 
Weighted-
Average
Exercise
Price Per Share
 
Weighted-Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017
 
439,550

 
$
20.07

 
 
 
 
Granted
 
129,400

 
$
29.19

 
 
 
 
Exercised
 
(212,775
)
 
$
20.38

 
 
 
 
Expired
 
(5,800
)
 
$
21.12

 
 
 
 
Forfeited
 
(44,150
)
 
$
22.19

 
 
 
 
Outstanding at December 31, 2017
 
306,225

 
$
23.38

 
5.2
 
$
1,654

Exerciseable at December 31, 2017
 
86,425

 
$
20.78

 
2.9
 
$
663
Schedule of Nonvested Options Activity
Changes in nonvested stock options for the year ended December 31, 2017 were as follows:
 
 
Number of Stock Options
 
Weighted-
Average
Grant
Date Fair Value
Nonvested at January 1, 2017
 
225,175

 
$
8.77

     Granted
 
129,400

 
$
11.88

     Vested
 
(90,625
)
 
$
8.87

     Forfeited
 
(44,150
)
 
$
7.93

Nonvested at December 31, 2017
 
219,800

 
$
11.07
Schedule of Assumptions Used
The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2017, 2016, and 2015 were as follows:
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
Risk-free interest rate
 
1.75
%
 
1.20
%
 
1.13
%
Expected volatility
 
50.37
%
 
51.79
%
 
53.72
%
Expected dividends
 
—

 
—

 
—

Expected term (in months)
 
48

 
48

 
47

The weighted-average assumptions used to determine the net periodic benefit costs under the two plans were as follows:

 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
Discount rate used to determine pension expense
 
 
 
 
 
 
Pension Plan
 
4.18
%
 
4.55
%
 
4.25
%
LaBarge Retirement Plan
 
3.75
%
 
4.00
%
 
3.70
%


The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows:

 
 
December 31,
 
 
2017
 
2016
 
2015
Discount rate used to determine value of obligations
 
 
 
 
 
 
Pension Plan
 
3.64
%
 
4.18
%
 
4.55
%
LaBarge Retirement Plan
 
3.40
%
 
3.75
%
 
4.00
%
Long-term rate of return - Pension Plan only
 
7.00
%
 
7.50
%
 
7.50
%
Schedule of Restricted Stock Units Activity
Restricted stock unit activity for the year ended December 31, 2017 was as follows:
 
 
Number of Restricted Stock Units
 
Weighted-
Average
Grant
Date Fair Value
Outstanding at January 1, 2017
 
193,382

 
$
18.88

     Granted
 
135,350

 
$
28.97

     Vested
 
(101,930
)
 
$
19.66

     Forfeited
 
(41,458
)
 
$
21.93

Outstanding at December 31, 2017
 
185,344

 
$
25.14
Schedule of Performance-based Units Activity
Performance stock activity for the year ended December 31, 2017 was as follows:
 
 
Number of Performance Stock Units
 
Weighted-
Average
Grant
Date Fair Value
Outstanding at January 1, 2017
 
121,637

 
$
20.39

     Granted
 
126,000

 
$
26.31

     Adjustment for target performance
 
37,350

 
$
25.48

     Vested
 
(43,487
)
 
$
24.98

     Forfeited
 
(20,000
)
 
$
22.63

Outstanding at December 31, 2017
 
221,500

 
$
23.52