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8. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income $ 738,794 $ 417,766  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 0    
Other comprehensive income, net of tax 321,028 35,628 $ 163,193
Foreign currency translation adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income 77,400 1,300 33,700
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 76,100 (32,400)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0  
Other Comprehensive Income (Loss), Tax 0 0  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 0    
Other comprehensive income, net of tax 76,100 (32,400)  
Other Postretirement Benefit Plan [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (22,300) (18,600) (20,700)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (6,500) 500  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,100 2,500  
Other Comprehensive Income (Loss), Tax 700 (900)  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 0    
Other comprehensive income, net of tax (3,700) 2,100  
Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income 683,700 435,000 369,100
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 203,600 105,100  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (100) (800)  
Other Comprehensive Income (Loss), Tax (74,900) (38,400)  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 120,100    
Other comprehensive income, net of tax 248,700 65,900  
Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income 738,800 417,700 $ 382,100
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 273,200 73,200  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,000 1,700  
Other Comprehensive Income (Loss), Tax (74,200) (39,300)  
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect 120,100    
Other comprehensive income, net of tax $ 321,100 $ 35,600