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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income $ (175,553)  
Total other comprehensive income (loss) net of tax (132,303) $ (214,022)
Ending balance, Accumulated other comprehensive income (307,856)  
Other (income) expense, net (32,597) (17,407)
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 (128,700) (214,700)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax   0
Other Comprehensive Income (Loss), Tax 100 400
Total other comprehensive income (loss) net of tax (128,600) (214,300)
Ending balance, Accumulated other comprehensive income (299,100) 84,300
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 400 1,700
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax   500
Other Comprehensive Income (Loss), Tax (100) (300)
Total other comprehensive income (loss) net of tax 300 1,900
Ending balance, Accumulated other comprehensive income (10,600) (24,100)
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 (5,200) (1,900)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax   (100)
Other Comprehensive Income (Loss), Tax 1,200 400
Total other comprehensive income (loss) net of tax (4,000) (1,600)
Ending balance, Accumulated other comprehensive income 1,800 8,200
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 (133,500) (214,900)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax   400
Other Comprehensive Income (Loss), Tax 1,200 500
Total other comprehensive income (loss) net of tax (132,300) (214,000)
Ending balance, Accumulated other comprehensive income $ (307,900) $ 68,400