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7. Accumulated Other Comprehensive Income 7. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Selling, general and administrative expense $ (189,716) $ (188,555)    
Other (income) expense, net (1,177) (1,153)    
Accumulated other comprehensive income 415,340   $ 382,138  
Total other comprehensive income (loss) net of tax 33,202 (11,499)    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 71,600 51,700 33,700 $ 71,200
Other Comprehensive Income (Loss), before Reclassifications, before Tax 37,900 (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 37,900 (19,500)    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (21,300) (15,200) (20,700) (16,300)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (900) 900    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 300 200    
Other Comprehensive Income (Loss), Tax 0 0    
Total other comprehensive income (loss) net of tax (600) 1,100    
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 (300) (200)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 365,000 170,900 369,100 164,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax (6,500) 11,200    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 (300)    
Other Comprehensive Income (Loss), Tax 2,400 (4,000)    
Total other comprehensive income (loss) net of tax (4,100) 6,900    
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 0 (300)    
Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income 415,300 207,400 $ 382,100 $ 218,900
Other Comprehensive Income (Loss), before Reclassifications, before Tax 30,500 (7,400)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 300 (100)    
Other Comprehensive Income (Loss), Tax 2,400 (4,000)    
Total other comprehensive income (loss) net of tax $ 33,200 $ (11,500)