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Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Assumptions used in accounting for the defined benefit plan
The assumptions used in accounting for the defined benefit plans were as follows for the years ended December 31:
 
2017
 
2016
 
2015
Weighted average discount rates for pension benefit obligation
3.40% - 3.55%

 
3.75% - 4.00%

 
3.90% - 4.20%

Weighted average discount rates for net periodic benefit cost
3.40% - 4.00%

 
3.90% - 4.20%

 
3.65% - 3.95%

Expected long-term rate of return on assets for net periodic benefit cost
7.50
%
 
7.50
%
 
7.75
%
The assumptions used in accounting for the postretirement health care plans are set forth below for the years ended December 31:
 
2017
 
2016
 
2015
Weighted average discount rates for benefit obligation
3.10
%
 
3.25
%
 
3.40
%
Weighted average discount rates for net periodic benefit cost
3.25
%
 
3.40
%
 
3.25
%
Health care cost trend rate assumed for next year
7.0
%
 
7.3
%
 
7.3
%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
5.0
%
 
5.0
%
 
5.0
%
Year that the rate reaches the ultimate trend rate
2025

 
2025

 
2025
Net periodic benefit income and expense for the defined benefit plan
Set forth below is a detail of the net periodic benefit expense for the postretirement health care plans for the years ended December 31:
 
2017
 
2016
 
2015
Service cost
$
50

 
$
70

 
$
70

Interest cost
101

 
116

 
113

Amortization of actuarial loss
97

 
132

 
91

Amortization of prior service credit
(17
)
 
(107
)
 
(107
)
Net periodic benefit expense
$
231

 
$
211

 
$
167

Set forth below is a detail of the net periodic pension expense (income) for the defined benefit plans for the years ended December 31:
 
2017
 
2016
 
2015
Interest cost
$
1,746

 
$
1,757

 
$
1,713

Expected return on plan assets
(2,843
)
 
(2,789
)
 
(2,733
)
Amortization of actuarial loss
363

 
415

 
495

Amortization of prior service cost
58

 
58

 
50

     Settlements
76

 
90

 
—

Net periodic pension income
$
(600
)
 
$
(469
)
 
$
(475
)
Changes in plan assets and benefit obligations recognized in comprehensive income (loss)
Set forth below is detail of other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss for the years ended December 31:
 
2017
 
2016
 
2015
Current year actuarial (gain) loss
$
(1,343
)
 
$
2,573

 
$
955

Amortization of actuarial loss
(363
)
 
(415
)
 
(495
)
Amortization of prior service cost
(58
)
 
(58
)
 
(50
)
Settlements
(76
)
 
(90
)
 
—

Total recognized in other comprehensive (income) loss
$
(1,840
)
 
$
2,010

 
$
410

Set forth below is a detail of other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) for the years ended December 31:
 
2017
 
2016
 
2015
Current year actuarial loss (gain)
$
154

 
$
(25
)
 
$
226

Amortization of actuarial loss
(97
)
 
(132
)
 
(91
)
Amortization of prior service credit
17

 
107

 
107

Total recognized in other comprehensive income (loss)
$
74

 
$
(50
)
 
$
242
Changes in benefit obligations during the year and funded status of defined benefit plan
The following table sets forth the changes in the benefit obligation and the plan assets during the year and the funded status of the defined benefit plans at December 31:
 
2017
2016
Change in benefit obligation
 
 
 
Projected benefit obligation at beginning of year
$
45,318

 
$
43,559

Interest cost
1,746

 
1,757

Actuarial loss (gain)
1,275

 
2,134

Benefits paid
(2,019
)
 
(1,811
)
Settlements
(255
)
 
(321
)
Projected benefit obligation at end of year
$
46,065

 
$
45,318

Accumulated benefit obligation at end of year
$
46,065

 
$
45,318

Change in plan assets
 
 
 
Fair value of plan assets at beginning of year
$
34,628

 
$
37,162

Actual return on plan assets
5,461

 
(1,157
)
Employer contributions
712

 
755

Benefits paid
(2,019
)
 
(1,811
)
Settlements
(255
)
 
(321
)
Fair value of plan assets at end of year
$
38,527

 
$
34,628

Funded status at end of year
$
(7,538
)
 
$
(10,690
)
Amounts recognized in the balance sheets consist of:
 
 
 
Noncurrent assets
$
2,051

 
$
1,387

Current liabilities
(700
)
 
(721
)
Non-current liabilities
(8,889
)
 
(11,356
)
 
$
(7,538
)
 
$
(10,690
)
Components of accumulated other comprehensive loss (income) consist of:
 
 
 
Actuarial loss
$
15,363

 
$
17,145

Prior service cost
937

 
995

Deferred taxes
(6,481
)
 
(7,127
)
 
$
9,819

 
$
11,013

The following sets forth the changes in benefit obligations during the year and the funded status of the postretirement health care at December 31:
 
2017
 
2016
Change in benefit obligation
 
 
 
Benefit obligation at beginning of year
$
3,211

 
$
3,466

Service cost
50

 
70

Interest cost
101

 
116

Actuarial loss (gain)
154

 
(25
)
Benefits paid
(295
)
 
(416
)
Benefit obligation at end of year
$
3,221

 
$
3,211

Funded status at end of year
$
(3,221
)
 
$
(3,211
)
Amounts recognized in the balance sheets consist of:
 
 
 
Current liabilities
$
(282
)
 
$
(294
)
Noncurrent liabilities
(2,939
)
 
(2,917
)
 
$
(3,221
)
 
$
(3,211
)
Components of accumulated other comprehensive loss (income) consist of:
 
 
 
Actuarial loss
$
1,040

 
$
983

Prior service credit
(78
)
 
(95
)
Deferred taxes
287

 
284

 
$
1,249

 
$
1,172
Future benefit payments
Future postretirement health care benefit payments expected to be paid are:
2018
$
281

2019
323

2020
357

2021
357

2022
324

2023 - 2027
1,395

 
$
3,037

Future pension benefit payments expected to be paid from assets of the pension plans are:
2018
$
2,537

2019
2,478

2020
2,559

2021
2,671

2022
2,768

2023 - 2027
14,222

 
$
27,235
Actual allocation percentage and target allocation percentage for pension plan assets
The following is the actual allocation percentage and target allocation percentage for the pension plan assets at December 31:
 
2017
Actual
Allocation
 
2016
Actual
Allocation
 
Target Allocation
Range
U.S. equity securities
47.2
%
 
46.4
%
 
36.0% - 54.0%
Non-U.S. equity securities
21.1
%
 
19.6
%
 
16.0% - 24.0%
Fixed income securities
31.4
%
 
33.6
%
 
30.0% - 40.0%
Money market
0.3
%
 
0.4
%
 
0.0% - 10.0%
Fair value of pension plan assets
Following are the values as of December 31:
 
Level 1
 
2017
 
2016
U.S. equity securities
$
18,175

 
$
16,054

Non-U.S. equity securities
8,120

 
6,792

Fixed income securities
12,097

 
11,657

Money market
135

 
125

Total
$
38,527

 
$
34,628
Effect of one-percentage-point change in assumed health care cost trend rates
A one-percentage-point change in the assumed health care cost trend rates would have the following effects at December 31, 2017:
 
1-Percentage-Point
Increase
 
1-Percentage-Point
Decrease
Effect on total of service and interest cost
$
12

 
$
(11
)
Effect on postretirement benefit obligation
$
254

 
$
(235
)