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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     $ 282,456  
Total other comprehensive income (loss) net of tax $ (188,207) $ 145,113 (345,497) $ 171,319
Ending balance, Accumulated other comprehensive income (63,041)   (63,041)  
Other (income) expense, net 579 (1,015) (16,732) (21,517)
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     298,600 (72,400)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (347,500) 167,400
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0
Other Comprehensive Income (Loss), Tax     400 0
Total other comprehensive income (loss) net of tax     (347,100) 167,400
Ending balance, Accumulated other comprehensive income (48,500) 95,000 (48,500) 95,000
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (26,000) (22,200)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     1,700 (1,300)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     2,600 1,800
Other Comprehensive Income (Loss), Tax     (500) 400
Total other comprehensive income (loss) net of tax     3,800 900
Ending balance, Accumulated other comprehensive income (22,200) (21,300) (22,200) (21,300)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (income) expense, net (1,000) (1,100) (2,600) (1,800)
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     9,800 7,200
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (2,700) 4,500
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (100) (600)
Other Comprehensive Income (Loss), Tax     700 (900)
Total other comprehensive income (loss) net of tax     (2,100) 3,000
Ending balance, Accumulated other comprehensive income 7,700 10,200 7,700 10,200
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (income) expense, net 0 0 (100) (600)
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     282,400 (87,400)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (348,500) 170,600
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     2,500 1,200
Other Comprehensive Income (Loss), Tax     600 (500)
Total other comprehensive income (loss) net of tax     (345,400) 171,300
Ending balance, Accumulated other comprehensive income $ (63,000) $ 83,900 $ (63,000) $ 83,900