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Other Comprehensive Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Foreign currency translation adjustments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  |  |  |  |  |  |  |  | $ (69,468) | $ 103,214 | $ (86,876)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  |  |  |  |  |  | (9,498) | 43,842 | (18,827)
Total foreign currency translation adjustments |  |  |  |  |  |  |  |  | (59,970) | 147,056 | (105,703)
Pension and other postretirement benefit plans [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax |  |  |  |  |  |  |  |  | (14,379) | 28,784 | 5,936
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax |  |  |  |  |  |  |  |  | 3,241 | (7,397) | (4,560)
Pension and other postretirement benefit plans |  |  |  |  |  |  |  |  | (11,138) | 21,387 | 1,376
Changes in fair value of cash flow hedges [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax |  |  |  |  |  |  |  |  | 3,416 | (3,678) | 860
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax |  |  |  |  |  |  |  |  | (717) | 1,287 | (301)
Changes in fair value of cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 2,699 | (2,391) | 559
Other Comprehensive Income Other Adjustment Net Of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income Loss Adjustment Before Tax |  |  |  |  |  |  |  |  |  | (1,687) | (1,119)
Other Comprehensive Income Loss Other Adjustment Tax |  |  |  |  |  |  |  |  |  | 202 | 134
Other comprehensive income loss other adjustment, net of tax |  |  |  |  |  |  |  |  | 0 | (1,485) | (985)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Tax |  |  |  |  |  |  |  |  | (80,431) | 126,633 | (81,199)
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  | 12,022 | 37,934 | (23,554)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (68,409) | 164,567 | (104,753)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $ (142,567) |  |  |  | $ (93,925) |  |  |  | (142,567) | (93,925) |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax | (102,932) |  |  |  | (100,538) |  |  |  | (102,932) | (100,538) |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | 2,403 |  |  |  | (296) |  |  |  | 2,403 | (296) |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (243,096) |  |  |  | (194,759) |  |  |  | (243,096) | (194,759) |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 141,569 | $ 157,305 | $ 139,959 | $ 131,434 | $ 296,448 | $ 178,912 | $ 164,058 | $ 172,247 | 570,267 | 811,665 | 508,892
Other comprehensive earnings (loss) |  |  |  |  |  |  |  |  | (68,409) | 164,567 | (104,753)
Comprehensive earnings |  |  |  |  |  |  |  |  | 501,858 | 976,232 | 404,139
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses |  |  |  |  |  |  |  |  | 4,893 | 7,735 | 8,544
Amortization of prior service costs and transition obligation |  |  |  |  |  |  |  |  | 3,631 | 4,424 | 6,609
Settlements and Curtailments |  |  |  |  |  |  |  |  | 12,565 | (3,844) | 0
Total before tax |  |  |  |  |  |  |  |  | 21,089 | 8,315 | 15,153
Tax benefit |  |  |  |  |  |  |  |  | (4,459) | (2,503) | (5,073)
Net of tax |  |  |  |  |  |  |  |  | 16,630 | 5,812 | 10,080
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net (gains) losses reclassified into earnings |  |  |  |  |  |  |  |  | 1,950 | (908) | 638
Tax expense (benefit) |  |  |  |  |  |  |  |  | (409) | 318 | (223)
Net of tax |  |  |  |  |  |  |  |  | $ 1,541 | $ (590) | $ 415

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