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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Ceded Credit Risk [Line Items] |  |
Premiums receivable | $ 4,851,513 | $ 3,781,542
Premium receivable, allowance for credit loss | 2,776 | 2,776
Reinsurance recoverable | 4,300,000 | 4,300,000
Reinsurance recoverable, allowance for credit loss | $ 8,344 | $ 8,344
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 20.00% | 19.90%
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 7.70% | 8.40%
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 4.60% | 4.30%
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 15.20% | 18.00%
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 10.30% | 13.90%
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 9.40% | 11.20%
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 48.30% | 46.90%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 50.80% | 52.10%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating |  |
Ceded Credit Risk [Line Items] |  |
Concentration risk, percentage | 1.00% | 1.00%

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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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