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Pensions and Other Postretirement Benefit Plans (Schedule of Funded Status of Plans and Composition of Accrued Pension Cost) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Noncurrent asset | $ 16,200 | $ 7,800 |
U.S. Pension Plans with Pension Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | (6,466) |  |
U.S. Pension Plans without Pension Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | (7,356) |  |
United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | (13,822) |  |
Non-U.S. Pension Plans with Pension Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | 13,870 |  |
Non-U.S. Pension Plans without Pension Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | (25,373) |  |
Non-U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | (11,503) |  |
Pension Plans with Pension Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | 7,404 |  |
Pension Plans without Pension Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net amount recognized | (32,729) |  |
Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 205,586 | 180,672 | $ 171,387
Benefit obligation | 230,911 | 210,856 | 199,856
Funded status | (25,325) | (30,184) |
Noncurrent asset | 16,242 | 7,794 |
Current liability | (2,094) | (2,057) |
Noncurrent liability | (39,473) | (35,921) |
Net amount recognized | (25,325) | (30,184) |
Net actuarial loss | 67,283 | 72,400 |
Prior service cost/(credit) | 572 | 597 |
Net amount recognized | 67,855 | 72,997 |
Other postretirement benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Benefit obligation | 58,531 | 57,488 | $ 59,970
Funded status | (58,531) | (57,488) |
Noncurrent asset |  |  |
Current liability | (4,108) | (4,195) |
Noncurrent liability | (54,423) | (53,293) |
Net amount recognized | (58,531) | (57,488) |
Net actuarial loss | 34,717 | 34,782 |
Prior service cost/(credit) | (26,411) | (30,899) |
Net amount recognized | $ 8,306 | $ 3,883 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -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 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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