Investments (Other Than Temporary Impairments by Asset Type) (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($) Securities	Sep. 30, 2018 USD ($) Securities	Sep. 30, 2019 USD ($) Securities	Sep. 30, 2018 USD ($) Securities
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		20	5	25
Total OTTI losses	$ (101)	$ (14,373)	$ (1,099)	$ (16,025)
Portion of OTTI losses recognized from other comprehensive income	0	0	(215)	(1,651)
Net OTTI losses recognized in operations	$ (101)	$ (14,373)	$ (1,314)	$ (17,676)
Corporate Securities \| Capital Goods
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		1		1
Total OTTI losses		$ (719)		$ (719)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (719)		$ (719)
Corporate Securities \| Consumer Discretionary
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		6		7
Total OTTI losses		$ (5,968)		$ (6,875)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (5,968)		$ (6,875)
Corporate Securities \| Energy
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		2		2
Total OTTI losses		$ (1,212)		$ (1,212)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (1,212)		$ (1,212)
Corporate Securities \| Financials
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		5		5
Total OTTI losses		$ (3,495)		$ (3,495)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (3,495)		$ (3,495)
Corporate Securities \| Information Technology
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		1		1
Total OTTI losses		$ (550)		$ (550)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (550)		$ (550)
Corporate Securities \| Telecommunications
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		2		2
Total OTTI losses		$ (249)		$ (249)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (249)		$ (249)
Corporate Securities \| Transportation
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		1		1
Total OTTI losses		$ (178)		$ (178)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (178)		$ (178)
Corporate Securities \| Utilities
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		1		1
Total OTTI losses		$ (94)		$ (94)
Portion of OTTI losses recognized from other comprehensive income		0		0
Net OTTI losses recognized in operations		$ (94)		$ (94)
Residential Mortgage Backed Securities
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities	1		3	3
Total OTTI losses	$ (101)		$ (101)	$ (63)
Portion of OTTI losses recognized from other comprehensive income	0		(215)	(295)
Net OTTI losses recognized in operations	$ (101)		$ (316)	$ (358)
Commercial Mortgage Backed Securities
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities		1	1	1
Total OTTI losses		$ (1,908)	$ (349)	$ (1,908)
Portion of OTTI losses recognized from other comprehensive income		0	0	0
Net OTTI losses recognized in operations		$ (1,908)	$ (349)	$ (1,908)
Other Asset Backed Securities
Other than Temporary Impairment Losses, Investments [Abstract]
Other than temporary impairment, number of securities \| Securities			1	1
Total OTTI losses			$ (649)	$ (682)
Portion of OTTI losses recognized from other comprehensive income			0	(1,356)
Net OTTI losses recognized in operations			$ (649)	$ (2,038)

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings.

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Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity.

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