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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.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Investments (Other Than Temporary Impairment by Asset Type) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Securities	Dec. 31, 2017 USD ($) Securities	Dec. 31, 2016 USD ($) Securities
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									35	10	22
Total OTTI losses									$ (35,005)	$ (2,758)	$ (21,349)
Portion of OTTI losses recognized in (from) other comprehensive income									(1,651)	(1,872)	(1,330)
Net OTTI losses recognized in operations	$ (18,980)	$ (14,373)	$ (2,396)	$ (907)	$ (3,076)	$ (464)	$ (949)	$ (141)	$ (36,656)	$ (4,630)	$ (22,679)
Corporate Securities \| Capital Goods
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									1
Total OTTI losses									$ (719)
Portion of OTTI losses recognized in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (719)
Corporate Securities \| Consumer Discretionary
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 in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (9,533)
Corporate Securities \| Energy
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									4		2
Total OTTI losses									$ (4,793)		$ (642)
Portion of OTTI losses recognized in (from) other comprehensive income									0		0
Net OTTI losses recognized in operations									$ (4,793)		$ (642)
Corporate Securities \| Financials
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 in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (3,495)
Corporate Securities \| Information Technology
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									1
Total OTTI losses									$ (550)
Portion of OTTI losses recognized in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (550)
Corporate Securities \| Industrials
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 in (from) other comprehensive income									0	0
Net OTTI losses recognized in operations									$ (2,299)	$ (2,485)
Corporate Securities \| Materials
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities											1
Total OTTI losses											$ (4,554)
Portion of OTTI losses recognized in (from) other comprehensive income											1,575
Net OTTI losses recognized in operations											$ (2,979)
Corporate Securities \| Telecommunications
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									2		1
Total OTTI losses									$ (249)		$ (4,462)
Portion of OTTI losses recognized in (from) other comprehensive income									0		562
Net OTTI losses recognized in operations									$ (249)		$ (3,900)
Corporate Securities \| Transportation
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									1
Total OTTI losses									$ (178)
Portion of OTTI losses recognized in (from) other comprehensive income									0
Net OTTI losses recognized in operations									$ (178)
Corporate Securities \| Utilities
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									2		2
Total OTTI losses									$ (5,518)		$ (6,961)
Portion of OTTI losses recognized in (from) other comprehensive income									0		798
Net OTTI losses recognized in operations									$ (5,518)		$ (6,163)
Residential Mortgage Backed Securities
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									3	8	9
Total OTTI losses									$ (63)	$ (273)	$ 0
Portion of OTTI losses recognized in (from) other comprehensive income									(295)	(1,585)	(783)
Net OTTI losses recognized in operations									$ (358)	$ (1,858)	$ (783)
Commercial Mortgage Backed Securities
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									5		5
Total OTTI losses									$ (4,859)		$ (1,540)
Portion of OTTI losses recognized in (from) other comprehensive income									0		0
Net OTTI losses recognized in operations									$ (4,859)		$ (1,540)
Other Asset Backed Securities
Gain (Loss) on Securities [Line Items]
Other than temporary impairment, number of securities \| Securities									2	1	2
Total OTTI losses									$ (2,749)	$ 0	$ (3,190)
Portion of OTTI losses recognized in (from) other comprehensive income									(1,356)	(287)	(3,482)
Net OTTI losses recognized in operations									$ (4,105)	$ (287)	$ (6,672)