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7. Accumulated Other Comprehensive Income 7. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Selling, general and administrative expense $ (194,940) $ (189,716)    
Other (income) expense, net (1,418) (1,177)    
Accumulated other comprehensive income 516,643   $ 417,766  
Total other comprehensive income (loss) net of tax 98,877 33,202    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 20,100 71,600 1,300 $ 33,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax 18,800 37,900    
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 18,800 37,900    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (18,700) (21,300) (18,600) (20,700)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (300) (900)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 200 300    
Other Comprehensive Income (Loss), Tax 0 0    
Total other comprehensive income (loss) net of tax (100) (600)    
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)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 515,200 365,000 435,000 369,100
Other Comprehensive Income (Loss), before Reclassifications, before Tax 127,100 (6,500)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (200) 0    
Other Comprehensive Income (Loss), Tax (46,700) 2,400    
Total other comprehensive income (loss) net of tax 80,200 (4,100)    
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 (200) 0    
Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 516,600 415,300 $ 417,700 $ 382,100
Other Comprehensive Income (Loss), before Reclassifications, before Tax 145,600 30,500    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 300    
Other Comprehensive Income (Loss), Tax (46,700) 2,400    
Total other comprehensive income (loss) net of tax $ 98,900 $ 33,200