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Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill			$ 49,610	$ 210,725	$ 210,725
Accumulated impairment losses	$ 0	$ (161,115)	0	(161,115)	(161,115)
Goodwill	49,610		49,610		49,610
Specialty P&C
Goodwill [Roll Forward]
Goodwill			0	161,115	161,115
Accumulated impairment losses		$ (161,100)	0		(161,115)
Goodwill	0		0		0
Workers' Compensation Insurance
Goodwill [Roll Forward]
Goodwill			44,110	44,110	44,110
Accumulated impairment losses			0		0
Goodwill	44,110		44,110		44,110
Segregated Portfolio Cell Reinsurance
Goodwill [Roll Forward]
Goodwill			5,500	$ 5,500	5,500
Accumulated impairment losses			0		0
Goodwill	$ 5,500		$ 5,500		$ 5,500

X

- Definition

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.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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