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Investments (Other Than Temporary Impairments by Asset Type) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Securities
Mar. 31, 2016
USD ($)
Securities
Other than Temporary Impairment Losses, Investments [Abstract]    
Other than temporary impairment, number of securities | Securities   11
Total OTTI losses $ 0 $ (6,018)
Portion of OTTI losses recognized in (from) other comprehensive income (141) 324
Net OTTI losses recognized in operations $ (141) $ (5,694)
Corporate Securities [Member] | Energy [Member]    
Other than Temporary Impairment Losses, Investments [Abstract]    
Other than temporary impairment, number of securities | Securities   2
Total OTTI losses   $ (642)
Portion of OTTI losses recognized in (from) other comprehensive income   0
Net OTTI losses recognized in operations   $ (642)
Corporate Securities [Member] | Telecommunications [Member]    
Other than Temporary Impairment Losses, Investments [Abstract]    
Other than temporary impairment, number of securities | Securities   1
Total OTTI losses   $ (4,462)
Portion of OTTI losses recognized in (from) other comprehensive income   562
Net OTTI losses recognized in operations   $ (3,900)
Corporate Securities [Member] | Utilities [Member]    
Other than Temporary Impairment Losses, Investments [Abstract]    
Other than temporary impairment, number of securities | Securities   1
Total OTTI losses   $ (136)
Portion of OTTI losses recognized in (from) other comprehensive income   0
Net OTTI losses recognized in operations   $ (136)
Residential Mortgage Backed Securities [Member]    
Other than Temporary Impairment Losses, Investments [Abstract]    
Other than temporary impairment, number of securities | Securities 3 4
Total OTTI losses $ 0 $ 0
Portion of OTTI losses recognized in (from) other comprehensive income (141) (238)
Net OTTI losses recognized in operations $ (141) $ (238)
Commercial Mortgage Backed Securities [Member]    
Other than Temporary Impairment Losses, Investments [Abstract]    
Other than temporary impairment, number of securities | Securities   3
Total OTTI losses   $ (778)
Portion of OTTI losses recognized in (from) other comprehensive income   0
Net OTTI losses recognized in operations   $ (778)