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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Premiums receivable | $ 3,781,542 | $ 2,894,631
Premium receivable, allowance for credit loss | 2,776 | 5,961
Reinsurance recoverable | 4,300,000 | 2,900,000
Reinsurance recoverable, allowance for credit loss | $ 8,344 | $ 6,334
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer One |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 19.90% | 15.30%
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 8.40% | 10.80%
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 4.30% | 6.70%
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 18.00% | 13.20%
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 13.90% | 13.00%
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 11.20% | 6.70%
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 46.90% | 45.20%
Rated A- or higher | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 52.10% | 53.40%
Rated lower than A- | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Concentration risk percentage | 1.00% | 1.40%

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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