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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     $ 282,456  
Total other comprehensive income (loss) net of tax $ 56,732 $ 87,813 (157,290) $ 26,206
Ending balance, Accumulated other comprehensive income 125,166   125,166  
Other (income) expense, net 96 (17,229) (17,311) (20,502)
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     (158,400) 22,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 0
Other Comprehensive Income (Loss), Tax     200 400
Total other comprehensive income (loss) net of tax     (158,200) 22,400
Ending balance, Accumulated other comprehensive income 140,400 (50,000) 140,400 (50,000)
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     1,300 (300)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     1,600 700
Other Comprehensive Income (Loss), Tax     (300) 200
Total other comprehensive income (loss) net of tax     2,600 600
Ending balance, Accumulated other comprehensive income (23,400) (21,600) (23,400) (21,600)
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 (1,100) (400) (1,600) (700)
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     (2,000) 4,700
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (100) (600)
Other Comprehensive Income (Loss), Tax     500 (900)
Total other comprehensive income (loss) net of tax     (1,600) 3,200
Ending balance, Accumulated other comprehensive income 8,200 10,400 8,200 10,400
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 0 (200) (100) (600)
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     (159,100) 26,400
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     1,500 100
Other Comprehensive Income (Loss), Tax     400 (300)
Total other comprehensive income (loss) net of tax     (157,200) 26,200
Ending balance, Accumulated other comprehensive income $ 125,200 $ (61,200) $ 125,200 $ (61,200)