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Retirement Benefits (Schedule of estimated remaining cash contributions) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Other Postretirement Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions in the currect fiscal year | $ 3,645
UNITED STATES | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions in the currect fiscal year | 0
UNITED KINGDOM | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions in the currect fiscal year | 297
JAPAN | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Estimated future employer contributions in the currect fiscal year | $ 0

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: 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 + Details
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