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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2021
Ceded Credit Risk [Line Items] |  |  |
Premiums receivable | $ 4,481,492 | $ 2,894,631 |
Premium receivable, allowance for credit loss | 3,725 | 5,961 | $ 3,782
Reinsurance recoverable | 3,200,000 | 2,900,000 |
Reinsurance recoverable, allowance for credit loss | $ 7,024 | $ 6,334 | $ 6,605
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 13.60% | 15.30% |
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 10.10% | 10.80% |
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 5.70% | 6.70% |
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 22.40% | 13.20% |
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 11.90% | 13.00% |
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 9.90% | 6.70% |
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 45.00% | 45.20% |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 53.80% | 53.40% |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 1.20% | 1.40% |

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