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8. Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive (loss) income $ (46,958) $ 738,794    
EquitySecuritiesWithoutReadilyDeterminableFairValueFairValueElection       $ 864,490
Other comprehensive income, net of tax (106,495) 321,028 $ 35,628  
Foreign currency translation adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive (loss) income (35,500) 77,400 1,300 77,400
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (112,900) 76,100    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Other Comprehensive Income (Loss), Tax 0 0    
Other comprehensive income, net of tax (112,900) 76,100    
Other Postretirement Benefit Plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive (loss) income (14,800) (22,300) (18,600) (22,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6,900 (6,500)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,400 2,100    
Other Comprehensive Income (Loss), Tax (1,800) 700    
Other comprehensive income, net of tax 7,500 (3,700)    
Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive (loss) income 3,300 683,700 435,000 4,400
EquitySecuritiesWithoutReadilyDeterminableFairValueFairValueElection       (679,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1,400) 203,600    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 300 (100)    
Other Comprehensive Income (Loss), Tax 0 (74,900)    
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect   120,100    
Other comprehensive income, net of tax (1,100) 248,700    
Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive (loss) income (47,000) 738,800 $ 417,700 59,500
EquitySecuritiesWithoutReadilyDeterminableFairValueFairValueElection       $ (679,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (107,400) 273,200    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2,700 2,000    
Other Comprehensive Income (Loss), Tax (1,800) (74,200)    
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect   120,100    
Other comprehensive income, net of tax $ (106,500) $ 321,100