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Retirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Plan contributions | $ 37 |  | $ 151 |
Pension Plans | Domestic Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Service cost | 0 | $ 0 | 0 | $ 0
Interest cost | 11 | 390 | 22 | 780
Expected return on plan assets | 0 | (586) | 0 | (1,171)
Amortization of net actuarial loss | 11 | 11 | 24 | 21
Amortization of prior service cost | 0 | 0 | 0 | 0
Foreign currency | 0 | 0 | 0 | 0
Net periodic cost (credit) | 22 | (185) | 46 | (370)
Settlement charge | 0 | 205 | 50 | 205
Net benefit cost (credit) | 22 | 20 | 96 | (165)
Pension Plans | Foreign Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Service cost | 35 | 24 | 72 | 48
Interest cost | 87 | 129 | 158 | 219
Expected return on plan assets | (82) | (101) | (191) | (197)
Amortization of net actuarial loss | 0 | 0 | 0 | 0
Amortization of prior service cost | 32 | 49 | 106 | 96
Foreign currency | (23) | 234 | (94) | 229
Net periodic cost (credit) | 49 | 335 | 51 | 395
Settlement charge | 0 | 0 | 0 | 0
Net benefit cost (credit) | 49 | 335 | 51 | 395
Postretirement Medical Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Plan contributions | 287 |  | 556 |
Service cost | 14 | 20 | 28 | 40
Interest cost | 75 | 90 | 150 | 181
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net actuarial loss | 0 | 0 | 0 | 0
Amortization of prior service cost | 0 | 0 | 0 | 0
Foreign currency | 0 | 0 | 0 | 0
Net periodic cost (credit) | 89 | 110 | 178 | 221
Settlement charge | 0 | 0 | 0 | 0
Net benefit cost (credit) | $ 89 | $ 110 | $ 178 | $ 221

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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Before Curtailment And Settlement Charge + References No definition available. + Details
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- Definition The amount of foreign currency recognized in net periodic benefit cost relating to benefit changes attributable to the company's operations in foreign counties + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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