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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     $ (175,553)  
Total other comprehensive income (loss) net of tax $ (225,530) $ 56,732 (357,833) $ (157,290)
Ending balance, Accumulated other comprehensive income (533,386)   (533,386)  
Other (income) expense, net (6,710) 96 (39,307) (17,311)
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (170,500) 298,600
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (348,200) (158,400)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 0
Other Comprehensive Income (Loss), Tax     600 200
Total other comprehensive income (loss) net of tax     (347,600) (158,200)
Ending balance, Accumulated other comprehensive income (518,100) 140,400 (518,100) 140,400
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (10,900) (26,000)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     700 1,300
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (100) (1,600)
Other Comprehensive Income (Loss), Tax     (300) (300)
Total other comprehensive income (loss) net of tax     500 2,600
Ending balance, Accumulated other comprehensive income (10,400) (23,400) (10,400) (23,400)
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 (100) (1,100) (100) (1,600)
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     5,800 9,800
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (14,400) (2,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (400) 100
Other Comprehensive Income (Loss), Tax     3,300 500
Total other comprehensive income (loss) net of tax     (10,700) (1,600)
Ending balance, Accumulated other comprehensive income (4,900) 8,200 (4,900) 8,200
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 400 0 400 (100)
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (175,600) 282,400
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (361,900) (159,100)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (500) (1,500)
Other Comprehensive Income (Loss), Tax     3,600 400
Total other comprehensive income (loss) net of tax     (357,800) (157,200)
Ending balance, Accumulated other comprehensive income $ (533,400) $ 125,200 $ (533,400) $ 125,200