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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				$ (498,042)
Net current period OCI		$ (45,373)	$ (206,575)	22,320	$ (451,469)
Ending Balance, June 30, 2023		(475,722)		(475,722)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(295,197)
OCI before reclassifications				4,142
Amounts reclassified from AOCI				12,235
Net current period OCI				16,377
Ending Balance, June 30, 2023		(278,820)		(278,820)
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(417,035)
OCI before reclassifications				17,099
Amounts reclassified from AOCI				4,025
Net current period OCI				21,124
Ending Balance, June 30, 2023		(395,911)		(395,911)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022	[1]			(121,838)
OCI before reclassifications	[1]			12,957
Amounts reclassified from AOCI	[1]			(8,210)
Net current period OCI	[1]			4,747
Ending Balance, June 30, 2023	[1]	(117,091)		(117,091)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(81,007)
OCI before reclassifications				0
Amounts reclassified from AOCI				1,196
Net current period OCI				1,196
Ending Balance, June 30, 2023		(79,811)		(79,811)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(498,042)
OCI before reclassifications				17,099
Amounts reclassified from AOCI				5,221
Net current period OCI		(45,373)	$ (206,575)	22,320	$ (451,469)
Ending Balance, June 30, 2023		$ (475,722)		$ (475,722)
[1] 1Represents change in unrealized gains (losses) on securities with credit loss recognized in earnings.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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