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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Selling, general and administrative expense $ (187,445) $ (202,550) $ (568,845) $ (600,663)    
Other (income) expense, net (732) (613) (8,992) (9,662)    
Accumulated other comprehensive income 379,380   379,380   $ 218,945  
Total other comprehensive income (loss) net of tax 47,333 (90,247) 160,435 (79,679)    
Accumulated Translation Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 61,100 119,100 61,100 119,100 71,200 $ 189,400
Other Comprehensive Income (Loss), before Reclassifications, before Tax     (10,100) (70,300)    
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     (10,100) (70,300)    
Accumulated Defined Benefit Plans Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (15,800) (7,200) (15,800) (7,200) (16,300) (8,100)
Other Comprehensive Income (Loss), before Reclassifications, before Tax     0 600    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     500 400    
Other Comprehensive Income (Loss), Tax     0 (100)    
Total other comprehensive income (loss) net of tax     500 900    
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 (600) (200) (500) (400)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 334,000 149,100 334,000 149,100 164,000 159,400
Other Comprehensive Income (Loss), before Reclassifications, before Tax     269,400 (16,300)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (400) 0    
Other Comprehensive Income (Loss), Tax     (99,000) 6,000    
Total other comprehensive income (loss) net of tax     170,000 (10,300)    
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 (100) 0 (400) 0    
Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 379,300 $ 261,000 379,300 261,000 $ 218,900 $ 340,700
Other Comprehensive Income (Loss), before Reclassifications, before Tax     259,300 (86,000)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     100 400    
Other Comprehensive Income (Loss), Tax     (99,000) 5,900    
Total other comprehensive income (loss) net of tax     $ 160,400 $ (79,700)