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Investments (Narrative) (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019 USD ($) Securities	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Securities	Dec. 31, 2019 USD ($) Securities	Dec. 31, 2018 USD ($)
Investments [Abstract]
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	98.00%				97.00%	98.00%
Number of securities in unrealized loss position | Securities	1,033				843	1,033
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	79.00%				75.00%	79.00%
Proceeds from sales of available for sale fixed maturity securities					$ 5,400,000	$ 1,000,000	$ 2,500,000
Principal repayments, calls and tenders of available for sale fixed maturity securities					2,900,000	2,300,000	1,400,000
Net OTTI losses recognized in operations	$ (17,412)	$ (101)	$ (1,213)	$ 0	0	(18,726)	$ (36,656)
Assets on deposit with state agencies to meet regulatory requirements	51,600,000				53,500,000	51,600,000
Fair value, concentration of risk, investments	$ 0				$ 0	$ 0

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This item represents the percentage of unrealized losses on fixed maturity securities that is on securities classified as investment grade.

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Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value.

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Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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