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Investments (OTTI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded $ 15,787  
Credit loss expense, Not Previously Recorded 16,027  
Other Impairment Charges 15,602  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 31,629 $ 104
Change in OTTI Balance 31,525  
Commercial Mortgage Loans [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Other Impairment Charges 0  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 240 0
Commercial mortgage loan, Credit Loss, Not Previously Recorded 240  
Other Investments [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Other Impairment Charges 0  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 39
Other investments, Credit Loss, Not Previously Recorded 0  
AFS Fixed Income Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 31,389 65
AFS Fixed Income Securities [Member] | US Treasury and Government [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 0  
Other Impairment Charges 14  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 14 0
AFS Fixed Income Securities [Member] | Foreign Government [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 21  
Other Impairment Charges 0  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 21 0
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 29  
Other Impairment Charges 62  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 91 65
AFS Fixed Income Securities [Member] | Corporate Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 13,412  
Other Impairment Charges 11,603  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 25,015 0
AFS Fixed Income Securities [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 1,565  
Other Impairment Charges 2,000  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 3,565 0
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 38  
Other Impairment Charges 1,852  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 1,890 0
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Available-for-sale, Credit Loss, Not Previously Recorded 722  
Other Impairment Charges 71  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 793 $ 0
Securities intended to sell [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 15,602