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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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