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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income $ 104,085   $ 738,794  
Total other comprehensive income (loss) net of tax 44,548 $ 98,877    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 123,900 20,100 77,400 $ 1,300
Other Comprehensive Income (Loss), before Reclassifications, before Tax 46,500 18,800    
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 46,500 18,800    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (22,600) (18,700) (22,300) (18,600)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (700) (300)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 300 200    
Other Comprehensive Income (Loss), Tax 100 0    
Total other comprehensive income (loss) net of tax (300) (100)    
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 (300) (200)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 2,800 515,200 4,500 435,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax (1,800) 127,100    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 100 (200)    
Other Comprehensive Income (Loss), Tax 0 (46,700)    
Total other comprehensive income (loss) net of tax (1,700) 80,200    
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 (200)    
Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 104,100 516,600 $ 59,600 $ 417,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax 44,000 145,600    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 400 0    
Other Comprehensive Income (Loss), Tax 100 (46,700)    
Total other comprehensive income (loss) net of tax $ 44,500 $ 98,900