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Investments (OTTI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit) $ 863   $ 10,930  
Credit Loss, Expense (Benefit) (4,946)   11,081  
Other Impairment Expense 613   16,215  
OTTI (benefit) expense recognized in earnings (4,333) $ (971) (27,296) $ (1,075)
Other Investments [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Other Impairment Expense 0   0  
OTTI (benefit) expense recognized in earnings 0 (197) 0 (236)
Other investments, Credit Loss Expense (Benefit) 0   0  
Commercial Mortgage Loans [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Other Impairment Expense 0   0  
OTTI (benefit) expense recognized in earnings (22) 0 (218) 0
CML, Credit Loss Expense (Benefit) (22)   218  
Available-for-sale Securities [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit) (4,923)   10,864  
Other Impairment Expense 613   16,215  
OTTI (benefit) expense recognized in earnings (4,310) (774) (27,079) (839)
Available-for-sale Securities [Member] | U.S. Government and Government Agencies [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit)     0  
Other Impairment Expense     14  
OTTI (benefit) expense recognized in earnings     (14) 0
Available-for-sale Securities [Member] | Foreign Government [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit) 7   28  
Other Impairment Expense 0   0  
OTTI (benefit) expense recognized in earnings (7) 0 (28) 0
Available-for-sale 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, Expense (Benefit) (12)   17  
Other Impairment Expense 0   62  
OTTI (benefit) expense recognized in earnings (12) 0 (79) (65)
Available-for-sale Securities [Member] | Corporate Securities [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit) (4,940)   8,472  
Other Impairment Expense 500   12,103  
OTTI (benefit) expense recognized in earnings (4,440) (774) (20,575) (774)
Available-for-sale 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, Expense (Benefit) (118)   1,447  
Other Impairment Expense 93   2,093  
OTTI (benefit) expense recognized in earnings (25) 0 (3,540) 0
Available-for-sale Securities [Member] | Residential Mortgage Backed Securities [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit) 125   847  
Other Impairment Expense 20   91  
OTTI (benefit) expense recognized in earnings (145) 0 (938) 0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Available-for-sale, Credit Loss, Expense (Benefit) 15   53  
Other Impairment Expense 0   1,852  
OTTI (benefit) expense recognized in earnings (15) 0 (1,905) 0
Held-to-maturity Securities [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Held to Maturity, Credit Loss Expense (Benefit) (1)   (1)  
Other Impairment Expense 0   0  
OTTI (benefit) expense recognized in earnings (1) 0 (1) 0
Held-to-maturity Securities [Member] | Corporate Securities [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Held to Maturity, Credit Loss Expense (Benefit) (1)   (1)  
Other Impairment Expense 0   0  
OTTI (benefit) expense recognized in earnings $ (1) $ 0 (1) $ 0
Other than temporary impairment losses, investments [Member]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
OTTI (benefit) expense recognized in earnings     $ (27,300)