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Non-pension Post-retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Weighted Average Assumed Health Care Cost Trend Rates
The weighted average assumed healthcare cost trend rates at December 31 were as follows:
 
U.S. Plans
 
Non-U.S. Plans
 
2017
 
2016
 
2017
 
2016
Healthcare cost trend rate assumed for next year
6.50
%
 
6.75
%
 
6.50
%
 
6.75
%
Ultimate healthcare trend rate
5.00
%
 
5.00
%
 
5.00
%
 
5.00
%
Year the ultimate trend rate is reached
2024

 
2024

 
2024

 
2024
Components of Nonpension Postretirement Benefit Obligation
The components of our non-pension post-retirement benefit obligation are as follows:
Year ended December 31,
(dollars in thousands)
 
U.S. Plans
 
Non-U.S. Plans
 
Total
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Change in accumulated non-pension post-retirement benefit obligation:
 
 
 
 
 
 
 
 
 
 
 
 
Benefit obligation, beginning of year
 
$
58,921

 
$
58,795

 
$
1,344

 
$
1,390

 
$
60,265

 
$
60,185

Service cost
 
631

 
797

 
1

 
1

 
632

 
798

Interest cost
 
2,104

 
2,608

 
44

 
51

 
2,148

 
2,659

Plan participants' contributions
 
525

 
528

 
—

 
—

 
525

 
528

Actuarial (gain) loss
 
(5,483
)
 
146

 
(108
)
 
(102
)
 
(5,591
)
 
44

Exchange rate fluctuations
 
—

 
—

 
90

 
46

 
90

 
46

Benefits paid
 
(4,050
)
 
(3,953
)
 
(76
)
 
(42
)
 
(4,126
)
 
(3,995
)
Benefit obligation, end of year
 
$
52,648

 
$
58,921

 
$
1,295

 
$
1,344

 
$
53,943

 
$
60,265

 
 
 
 
 
 
 
 
 
 
 
 
 
Funded status and accrued benefit cost
 
$
(52,648
)
 
$
(58,921
)
 
$
(1,295
)
 
$
(1,344
)
 
$
(53,943
)
 
$
(60,265
)
Non-pension Post-retirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Benefit Costs
The provision for our non-pension post-retirement benefit expense consists of the following:
Year ended December 31,
(dollars in thousands)
 
U.S. Plans
 
Non-U.S. Plans
 
Total
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Service cost (benefits earned during the period)
 
$
631

 
$
797

 
$
855

 
$
1

 
$
1

 
$
1

 
$
632

 
$
798

 
$
856

Interest cost on projected benefit obligation
 
2,104

 
2,608

 
2,537

 
44

 
51

 
52

 
2,148

 
2,659

 
2,589

Amortization of unrecognized:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
 
(201
)
 
140

 
140

 
—

 
—

 
—

 
(201
)
 
140

 
140

Actuarial loss (gain)
 
(257
)
 
81

 
592

 
(59
)
 
(47
)
 
(56
)
 
(316
)
 
34

 
536

Non-pension post-retirement benefit expense
 
$
2,277

 
$
3,626

 
$
4,124

 
$
(14
)
 
$
5

 
$
(3
)
 
$
2,263

 
$
3,631

 
$
4,121
Schedule of Assumptions Used
The discount rates used to determine the accumulated post-retirement benefit obligation and net post-retirement benefit cost were as follows:
 
U.S. Plans
 
Non-U.S. Plans
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Accumulated post-retirement benefit obligation
3.60
%
 
4.05
%
 
4.56
%
 
3.26
%
 
3.48
%
 
3.69
%
Net post-retirement benefit cost
4.05
%
 
4.56
%
 
4.10
%
 
3.48
%
 
3.69
%
 
3.61
%
Net Accrued Benefit Liability
The total accrued non-pension post-retirement benefits liability at December 31 of the respective year-ends were included in the Consolidated Balance Sheets as follows:
December 31,
(dollars in thousands)
 
2017
 
2016
Non-pension post-retirement benefits (current portion)
 
$
4,185

 
$
4,892

Non-pension post-retirement benefits
 
49,758

 
55,373

Total non-pension post-retirement benefits liability
 
$
53,943

 
$
60,265
Amounts Recognized in Accumulated Other Comprehensive Loss
The pretax amounts recognized in accumulated other comprehensive loss as of December 31, 2017 and 2016, are as follows:
Year ended December 31,
(dollars in thousands)
 
U.S. Plans
 
Non-U.S. Plans
 
Total
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net actuarial loss (gain)
 
$
(80
)
 
$
5,146

 
$
(832
)
 
$
(730
)
 
$
(912
)
 
$
4,416

Prior service cost (credit)
 
(1,262
)
 
(1,463
)
 
—

 
—

 
(1,262
)
 
(1,463
)
Total cost (credit)
 
$
(1,342
)
 
$
3,683

 
$
(832
)
 
$
(730
)
 
$
(2,174
)
 
$
2,953
Amounts in Accumulated Other Comprehensive Loss to be Recognized During 2018
The pretax amounts in accumulated other comprehensive loss at December 31, 2017, that are expected to be recognized as components of net periodic benefit cost during 2018 are as follows:
(dollars in thousands)
 
U.S. Plans
 
Non-U.S. Plans
 
Total
Net actuarial loss (gain)
 
$
(210
)
 
$
(66
)
 
$
(276
)
Prior service cost (credit)
 
(282
)
 
—

 
(282
)
Total cost (credit)
 
$
(492
)
 
$
(66
)
 
$
(558
)
Anticipated Benefit Payments
Non-pension post-retirement benefit payments net of estimated future Medicare Part D subsidy payments and future retiree contributions, are anticipated to be paid as follows:
Fiscal Year
(dollars in thousands)
 
U.S. Plans
 
Non-U.S. Plans
 
Total
2018
 
$
4,098

 
$
161

 
$
4,259

2019
 
$
4,024

 
$
159

 
$
4,183

2020
 
$
3,965

 
$
153

 
$
4,118

2021
 
$
3,850

 
$
142

 
$
3,992

2022
 
$
3,853

 
$
130

 
$
3,983

2023-2027
 
$
16,848

 
$
373

 
$
17,221