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Reserve for Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Minimum period for claims resolution | 5 years |  |
Summary of reserve for losses and loss adjustment expenses |  |  |
Balance, beginning of year | $ 3,401,281 | $ 3,471,147 | $ 3,471,147
Less reinsurance recoverables on unpaid losses and loss adjustment expenses | 445,573 | 431,889 | 431,889
Net balance, beginning of year | 2,955,708 | 3,039,258 | 3,039,258
Net losses: |  |  |
Current year | 195,110 | 198,240 | 794,848
(Favorable) unfavorable development of reserves established in prior years, net | (416) | 7,056 | 5,646
Total | 194,694 | 205,296 | 800,494
Paid related to: |  |  |
Current year | (12,867) | (11,052) | (101,996)
Prior years | (202,180) | (211,916) | (782,048)
Total paid | (215,047) | (222,968) | (884,044)
Net balance, end of period | 2,935,355 | 3,021,586 | 2,955,708
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses | 447,157 | 447,693 | 445,573
Balance, end of period | 3,382,512 | 3,469,279 | 3,401,281
Net unfavorable prior year reserve development | 900 |  |
Net unfavorable reserve development attributable to parent | 400 |  |
Net favorable development in workers' compensation business | 500 |  |
Net unfavorable development medical professional liability business | 1,400 |  |
NORCAL Group |  |  |
Net losses: |  |  |
Current year | 1,700 |  |
(Favorable) unfavorable development of reserves established in prior years, net | $ 1,700 | $ 2,500 | $ 8,300

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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