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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance, Accumulated other comprehensive income $ 282,456  
Total other comprehensive income (loss) net of tax (214,022) $ (61,607)
Ending balance, Accumulated other comprehensive income 68,434  
Other (income) expense, net (17,407) (3,273)
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 (214,700) (62,900)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0
Other Comprehensive Income (Loss), Tax 400 900
Total other comprehensive income (loss) net of tax (214,300) (62,000)
Ending balance, Accumulated other comprehensive income 84,300 (134,400)
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 1,700 200
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 500 300
Other Comprehensive Income (Loss), Tax (300) 200
Total other comprehensive income (loss) net of tax 1,900 700
Ending balance, Accumulated other comprehensive income (24,100) (21,500)
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 (1,900) 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (100) (400)
Other Comprehensive Income (Loss), Tax 400 100
Total other comprehensive income (loss) net of tax (1,600) (300)
Ending balance, Accumulated other comprehensive income 8,200 6,900
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 (214,900) (62,700)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 400 (100)
Other Comprehensive Income (Loss), Tax 500 1,200
Total other comprehensive income (loss) net of tax (214,000) (61,600)
Ending balance, Accumulated other comprehensive income $ 68,400 $ (149,000)