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Significant Accounting Policies (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Decrease to retained earnings for the cumulative after-tax effect of adopting ASC 326 | $ (602,583,000) | $ (573,619,000) |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member |
Accrued interest receivable on available-for-sale securities | $ 5,000,000.0 |  |
Premium receivable, allowance for credit loss | 500,000 | $ 700,000 |
Reinsurance, allowance for credit loss | $ 0 | $ 0 |
Cumulative Effect, Period Of Adoption, Adjustment [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Decrease to retained earnings for the cumulative after-tax effect of adopting ASC 326 |  |  | $ 600,000
Minimum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Short-term investment maturity period | 3 months |  |

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