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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income $ (466,822)  
Total other comprehensive income (loss) net of tax 58,470 $ (132,303)
Ending balance, Accumulated other comprehensive income (408,352)  
Other (income) expense, net (50,431) (32,597)
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income (466,500) (170,500)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 55,400 (128,700)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0  
Other Comprehensive Income (Loss), Tax (200) 100
Total other comprehensive income (loss) net of tax 55,200 (128,600)
Ending balance, Accumulated other comprehensive income (411,300) (299,100)
Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income 10,000 (10,900)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 100 400
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 100  
Other Comprehensive Income (Loss), Tax 100 (100)
Total other comprehensive income (loss) net of tax 100 300
Ending balance, Accumulated other comprehensive income 10,100 (10,600)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income (10,300) 5,800
Other Comprehensive Income (Loss), before Reclassifications, before Tax 4,000 (5,200)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (200)  
Other Comprehensive Income (Loss), Tax (1,000) 1,200
Total other comprehensive income (loss) net of tax 3,200 (4,000)
Ending balance, Accumulated other comprehensive income (7,100) 1,800
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income (466,800) (175,600)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 59,500 (133,500)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (100)  
Other Comprehensive Income (Loss), Tax (1,100) 1,200
Total other comprehensive income (loss) net of tax 58,500 (132,300)
Ending balance, Accumulated other comprehensive income $ (408,300) $ (307,900)