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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Selling, general and administrative expense $ (205,536) $ (192,845) $ (395,252) $ (381,400)    
Other (income) expense, net (11,208) (7,107) (12,385) (8,260)    
Accumulated other comprehensive income 459,560   459,560   $ 382,138  
Total other comprehensive income (loss) net of tax 44,220 124,601 77,422 113,102    
Accumulated Translation Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 53,200 88,800 53,200 88,800 33,700 $ 71,200
Other Comprehensive Income (Loss), before Reclassifications, before Tax     19,500 17,600    
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     19,500 17,600    
Accumulated Defined Benefit Plans Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (20,800) (15,900) (20,800) (15,900) (20,700) (16,300)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (600) 300    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     600 (100)    
Other Comprehensive Income (Loss), Tax     (100) 200    
Total other comprehensive income (loss) net of tax     (100) 400    
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) 300 (600) 100    
Accumulated Net Unrealized Investment Gain (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 427,100 259,100 427,100 259,100 369,100 164,000
Other Comprehensive Income (Loss), before Reclassifications, before Tax     92,300 150,800    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (500) (300)    
Other Comprehensive Income (Loss), Tax     (33,800) (55,400)    
Total other comprehensive income (loss) net of tax     58,000 95,100    
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 (500) 0 (500) (300)    
Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 459,500 $ 332,000 459,500 332,000 $ 382,100 $ 218,900
Other Comprehensive Income (Loss), before Reclassifications, before Tax     111,200 168,700    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     100 (400)    
Other Comprehensive Income (Loss), Tax     (33,900) (55,200)    
Total other comprehensive income (loss) net of tax     $ 77,400 $ 113,100