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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     $ 738,794  
Total other comprehensive income (loss) net of tax $ (13,589) $ 6,214 (91,836) $ 199,396
Ending balance, Accumulated other comprehensive income (32,299)   (32,299)  
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     77,400 1,300
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (91,200) 71,100
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 0
Other Comprehensive Income (Loss), Tax     0 0
Total other comprehensive income (loss) net of tax     (91,200) 71,100
Ending balance, Accumulated other comprehensive income (13,800) 72,400 (13,800) 72,400
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     (22,300) (18,600)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     500 (1,900)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     1,200 (500)
Other Comprehensive Income (Loss), Tax     (400) 600
Total other comprehensive income (loss) net of tax     1,300 (1,800)
Ending balance, Accumulated other comprehensive income (21,000) (20,400) (21,000) (20,400)
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 (400) 500 (1,200) 500
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     4,500 435,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (2,300) 206,200
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     300 (300)
Other Comprehensive Income (Loss), Tax     0 (75,800)
Total other comprehensive income (loss) net of tax     (2,000) 130,100
Ending balance, Accumulated other comprehensive income 2,500 565,100 2,500 565,100
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 100 (300) 300 (300)
Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, Accumulated other comprehensive income     59,600 417,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (93,000) 275,400
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     1,500 (800)
Other Comprehensive Income (Loss), Tax     (400) (75,200)
Total other comprehensive income (loss) net of tax     (91,900) 199,400
Ending balance, Accumulated other comprehensive income $ (32,300) $ 617,100 $ (32,300) $ 617,100