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Investments (Other Than Temporary Impairment by Asset Type) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                 9 35 10
Total OTTI losses                 $ (18,511) $ (35,005) $ (2,758)
Portion of OTTI losses recognized from other comprehensive income                 (215) (1,651) (1,872)
Net OTTI losses recognized in operations $ (17,412) $ (101) $ (1,213) $ 0 $ (18,980) $ (14,373) $ (2,396) $ (907) $ (18,726) $ (36,656) $ (4,630)
Residential Mortgage Backed Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                 3 3 8
Total OTTI losses                 $ (101) $ (63) $ (273)
Portion of OTTI losses recognized from other comprehensive income                 (215) (295) (1,585)
Net OTTI losses recognized in operations                 $ (316) $ (358) $ (1,858)
Commercial Mortgage Backed Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                 2 5  
Total OTTI losses                 $ (488) $ (4,859)  
Portion of OTTI losses recognized from other comprehensive income                 0 0  
Net OTTI losses recognized in operations                 $ (488) $ (4,859)  
Other Asset Backed Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                 1 2 1
Total OTTI losses                 $ (649) $ (2,749) $ 0
Portion of OTTI losses recognized from other comprehensive income                 0 (1,356) (287)
Net OTTI losses recognized in operations                 $ (649) $ (4,105) $ (287)
Capital Goods | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   1  
Total OTTI losses                   $ (719)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (719)  
Consumer Discretionary | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   8  
Total OTTI losses                   $ (9,533)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (9,533)  
Energy | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                 3 4  
Total OTTI losses                 $ (17,273) $ (4,793)  
Portion of OTTI losses recognized from other comprehensive income                 0 0  
Net OTTI losses recognized in operations                 $ (17,273) $ (4,793)  
Financials | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   5  
Total OTTI losses                   $ (3,495)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (3,495)  
Information Technology | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   1  
Total OTTI losses                   $ (550)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (550)  
Industrials | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   1 1
Total OTTI losses                   $ (2,299) $ (2,485)
Portion of OTTI losses recognized from other comprehensive income                   0 0
Net OTTI losses recognized in operations                   $ (2,299) $ (2,485)
Telecommunications | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   2  
Total OTTI losses                   $ (249)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (249)  
Transportation | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   1  
Total OTTI losses                   $ (178)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (178)  
Utilities | Corporate Securities                      
Gain (Loss) on Securities [Line Items]                      
Other than temporary impairment, number of securities | Securities                   2  
Total OTTI losses                   $ (5,518)  
Portion of OTTI losses recognized from other comprehensive income                   0  
Net OTTI losses recognized in operations                   $ (5,518)