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Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2020
Goodwill [Line Items]
Goodwill, gross					$ 210,725
Accumulated impairment loss	$ (205,225)		$ (205,225)
Goodwill [Roll Forward]
Goodwill			49,610
Impairment losses	(44,110)	$ 0	(44,110)	$ 0
Goodwill	5,500		5,500
Specialty P&C
Goodwill [Line Items]
Goodwill, gross					161,115
Accumulated impairment loss	(161,115)		(161,115)			$ (161,100)
Goodwill [Roll Forward]
Goodwill			0
Impairment losses			0
Goodwill	0		0
Segregated Portfolio Cell Reinsurance
Goodwill [Line Items]
Goodwill, gross					5,500
Accumulated impairment loss	0		0
Goodwill [Roll Forward]
Goodwill			5,500
Impairment losses			0
Goodwill	5,500		5,500
Workers' Compensation Insurance Reporting Unit
Goodwill [Line Items]
Goodwill, gross					$ 44,110
Accumulated impairment loss	(44,110)		(44,110)
Goodwill [Roll Forward]
Goodwill			44,110
Impairment losses	(44,100)		(44,110)
Goodwill	$ 0		$ 0

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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