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8. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income $ 382,138 $ 218,945  
Other comprehensive income, net of tax 163,193 (121,772) $ 66,349
Foreign currency translation adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income 33,700 71,200 189,400
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (37,500) (117,000)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 (1,200)  
Other Comprehensive Income (Loss), Tax 0 0  
Other comprehensive income, net of tax (37,500) (118,200)  
Other Postretirement Benefit Plan [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (20,700) (16,300) (8,100)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6,800) (11,400)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1,100 700  
Other Comprehensive Income (Loss), Tax 1,300 2,500  
Other comprehensive income, net of tax (4,400) (8,200)  
Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income 369,100 164,000 159,400
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 325,400 7,300  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (900) 0  
Other Comprehensive Income (Loss), Tax (119,400) (2,700)  
Other comprehensive income, net of tax 205,100 4,600  
Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income 382,100 218,900 $ 340,700
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 281,100 (121,100)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 200 (500)  
Other Comprehensive Income (Loss), Tax (118,100) (200)  
Other comprehensive income, net of tax $ 163,200 $ (121,800)