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8. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive (loss) income $ (466,822) $ (175,553)  
Other comprehensive income, net of tax (291,269) (458,009) $ 369,804
Foreign currency translation adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive (loss) income (466,500) (170,500) 298,600
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (296,300) (469,500)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0  
Other Comprehensive Income (Loss), Tax 300 400  
Other comprehensive income, net of tax (296,000) (469,100)  
Other Postretirement Benefit Plan [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive (loss) income 10,000 (10,900) (26,000)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 25,400 17,900  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 100 300  
Other Comprehensive Income (Loss), Tax (4,600) (3,100)  
Other comprehensive income, net of tax 20,900 15,100  
Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive (loss) income (10,300) 5,800 9,800
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (21,500) (4,000)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 600 (1,200)  
Other Comprehensive Income (Loss), Tax 4,800 1,200  
Other comprehensive income, net of tax (16,100) (4,000)  
Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive (loss) income (466,800) (175,600) $ 282,400
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (292,400) (455,600)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 700 (900)  
Other Comprehensive Income (Loss), Tax 500 (1,500)  
Other comprehensive income, net of tax $ (291,200) $ (458,000)