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Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |
Schedule VI - Supplementary Information Concerning Property-Casualty Insurance Operations | Schedule VI W. R. Berkley Corporation and Subsidiaries Supplementary Information Concerning Property-Casualty Insurance Operations Years Ended December 31, 2023, 2022 and 2021
(In thousands) | 2023 |  | 2022 |  | 2021
Deferred policy acquisition costs | $ | 861,609 |  |  | $ | 763,486 |  |  | $ | 676,145 |
Reserves for losses and loss expenses | 18,739,652 |  |  | 17,011,223 |  |  | 15,390,888 |
Unearned premiums | 5,922,326 |  |  | 5,297,654 |  |  | 4,847,160 |
Net premiums earned | 10,400,687 |  |  | 9,561,429 |  |  | 8,106,031 |
Net investment income | 1,052,835 |  |  | 779,185 |  |  | 671,618 |
Losses and loss expenses incurred: |  |  |  |  |
Current year | 6,311,780 |  |  | 5,774,713 |  |  | 4,921,191 |
Prior years | 29,681 |  |  | 54,511 |  |  | 863 |
Loss reserve discount accretion | 30,681 |  |  | 32,526 |  |  | 31,906 |
Amortization of deferred policy acquisition costs | 1,038,975 |  |  | 1,038,903 |  |  | 961,628 |
Paid losses and loss expenses | 4,981,610 |  |  | 4,347,910 |  |  | 3,665,694 |
Net premiums written | 10,954,467 |  |  | 10,004,070 |  |  | 8,862,867 |
___________________ See Report of Independent Registered Public Accounting Firm.

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- Definition The entire disclosure of supplemental information for registrant, its subsidiary and 50-percent-or-less-owned equity basis investee, with liability for property-casualty insurance claim. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column A)(c)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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