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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