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Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 17, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  | $ 612,997,000 | $ 358,042,000 |  |
Other income (expense) | $ (18,225,000) | $ (3,300,000) | $ (13,408,000) | $ (6,573,000) | $ 17,033,000 | $ (21,525,000) | $ 10,460,000 | $ (2,948,000) | (11,034,000) | (24,771,000) | $ (21,215,000) |
Mt. Logan Re Segregated Accounts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  | 46,390,000 | 45,625,000 |  |
Other income (expense) |  |  |  |  |  |  |  |  | 765,000 | (4,695,000) | (6,352,000) |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  | 44,646,000 | 44,737,000 |  |
Other income (expense) |  |  |  |  |  |  |  |  | $ 458,000 | $ (5,299,000) | $ (6,872,000) |
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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