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7. Accumulated Other Comprehensive Income 7. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Selling, general and administrative expense $ (196,769) $ (201,452) $ (604,736) $ (596,704)    
Other (income) expense, net (1,436) (1,439) (14,611) (13,824)    
Accumulated other comprehensive income 617,162   617,162   $ 417,766  
Total other comprehensive income (loss) net of tax 6,214 61,842 199,396 139,265    
Accumulated Translation Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 72,400 56,600 72,400 56,600 1,300 $ 33,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax     71,100 22,900    
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     71,100 22,900    
Accumulated Defined Benefit Plans Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (20,400) (20,700) (20,400) (20,700) (18,600) (20,700)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (1,900) (700)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (500) 900    
Other Comprehensive Income (Loss), Tax     600 (200)    
Total other comprehensive income (loss) net of tax     (1,800) 0    
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Selling, general and administrative expense 500 (300) 500 (900)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 565,100 485,500 565,100 485,500 435,000 369,100
Other Comprehensive Income (Loss), before Reclassifications, before Tax     206,200 184,800    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (300) (600)    
Other Comprehensive Income (Loss), Tax     (75,800) (67,800)    
Total other comprehensive income (loss) net of tax     130,100 116,400    
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 (300) (100) (300) (600)    
Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 617,100 $ 521,400 617,100 521,400 $ 417,700 $ 382,100
Other Comprehensive Income (Loss), before Reclassifications, before Tax     275,400 207,000    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (800) 300    
Other Comprehensive Income (Loss), Tax     (75,200) (68,000)    
Total other comprehensive income (loss) net of tax     $ 199,400 $ 139,300