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Investments (Other Than Temporary Impairments by Asset Type) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Securities
Jun. 30, 2017
USD ($)
Securities
Jun. 30, 2018
USD ($)
Securities
Jun. 30, 2017
USD ($)
Securities
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities 4 3 5 6
Total OTTI losses $ (745) $ 0 $ (1,652) $ 0
Portion of OTTI losses recognized in (from) other comprehensive income (1,651) (949) (1,651) (1,090)
Net OTTI losses recognized in operations $ (2,396) $ (949) $ (3,303) $ (1,090)
Corporate Securities [Member] | Consumer Discretionary [Member]        
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities     1  
Total OTTI losses     $ (907)  
Portion of OTTI losses recognized in (from) other comprehensive income     0  
Net OTTI losses recognized in operations     $ (907)  
Residential Mortgage Backed Securities [Member]        
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities 3 2 3 5
Total OTTI losses $ (63) $ 0 $ (63) $ 0
Portion of OTTI losses recognized in (from) other comprehensive income (295) (662) (295) (803)
Net OTTI losses recognized in operations $ (358) $ (662) $ (358) $ (803)
Other Asset Backed Securities [Member]        
Other than Temporary Impairment Losses, Investments [Abstract]        
Other than temporary impairment, number of securities | Securities 1 1 1 1
Total OTTI losses $ (682) $ 0 $ (682) $ 0
Portion of OTTI losses recognized in (from) other comprehensive income (1,356) (287) (1,356) (287)
Net OTTI losses recognized in operations $ (2,038) $ (287) $ (2,038) $ (287)