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7. Accumulated Other Comprehensive Income 7. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Selling, general and administrative expense $ (213,027) $ (205,536) $ (407,967) $ (395,252)    
Other (income) expense, net (11,757) (11,208) (13,175) (12,385)    
Accumulated other comprehensive income 610,948   610,948   $ 417,766  
Total other comprehensive income (loss) net of tax 94,305 44,220 193,182 77,422    
Accumulated Translation Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 61,800 53,200 61,800 53,200 1,300 $ 33,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax     60,500 19,500    
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     60,500 19,500    
Accumulated Defined Benefit Plans Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (20,600) (20,800) (20,600) (20,800) (18,600) (20,700)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (2,500) (600)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 600    
Other Comprehensive Income (Loss), Tax     500 (100)    
Total other comprehensive income (loss) net of tax     (2,000) (100)    
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 200 (300) 0 (600)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 569,700 427,100 569,700 427,100 435,000 369,100
Other Comprehensive Income (Loss), before Reclassifications, before Tax     213,200 92,300    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 (500)    
Other Comprehensive Income (Loss), Tax     (78,500) (33,800)    
Total other comprehensive income (loss) net of tax     134,700 58,000    
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 200 (500) 0 (500)    
Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 610,900 $ 459,500 610,900 459,500 $ 417,700 $ 382,100
Other Comprehensive Income (Loss), before Reclassifications, before Tax     271,200 111,200    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     0 100    
Other Comprehensive Income (Loss), Tax     (78,000) (33,900)    
Total other comprehensive income (loss) net of tax     $ 193,200 $ 77,400