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Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 17, 2019
Debt Instrument [Line Items]
Other assets	$ 742,369,000	$ 612,997,000
Other income (expense)	6,487,000	(4,660,000)	$ (24,251,000)
Mt. Logan Re Segregated Accounts [Member]
Debt Instrument [Line Items]
Other assets	67,645,000	46,390,000
Other income (expense)	6,255,000	765,000	(4,695,000)
Parent Company [Member]
Debt Instrument [Line Items]
Other assets	64,692,000	44,646,000
Other income (expense)	$ 5,833,000	$ 458,000	$ (5,299,000)
Parent Company [Member] | Notes Payable Other Payables [Member]
Debt Instrument [Line Items]
Debt instrument face amount				$ 300,000,000
Maturity Date	Dec. 01, 2028
Debt instrument, stated interest rate				1.69%

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Face (par) amount of debt instrument at time of issuance.

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