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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |  |
Net earnings | $ 683,451 | $ 677,918 | $ 570,267
Foreign currency translation adjustments [Abstract] |  |  |
Foreign currency translation gains (losses) | 55,450 | (5,025) | (59,970)
Reclassification of foreign currency translation losses (gains) to earnings | 0 | 25,339 | 0
Total foreign currency translation adjustments | 55,450 | 20,314 | (59,970)
Pension and other postretirement benefit plans [Abstract] |  |  |
Actuarial gains (losses) | 705 | 47 | (13,107)
Prior service credit (cost) | 828 | 1,818 | (14,661)
Amortization of actuarial losses including in net periodic pension cost | 6,695 | 596 | 3,829
Amortization of prior service costs included in net periodic pension cost | 1,153 | 2,141 | 2,875
Settlement and curtailment | 18 | 806 | 9,926
Total pension and other postretirement benefit plans | 9,399 | 5,408 | (11,138)
Changes in fair value of cash flow hedges [Abstract] |  |  |
Unrealized net (losses) gains | (1,445) | 1,495 | 1,158
Net (gains) losses reclassified into earnings | (632) | (147) | 1,541
Total cash flow hedges | (2,077) | 1,348 | 2,699
Other comprehensive earnings (loss), net of tax | 62,772 | 27,070 | (68,409)
Comprehensive earnings | $ 746,223 | $ 704,988 | $ 501,858

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