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Schedule III - Supplementary Insurance Information | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |
Schedule III - Supplementary Insurance Information | Schedule III W. R. Berkley Corporation and Subsidiaries Supplementary Insurance Information December 31, 2023, 2022 and 2021
(In thousands) | Deferred Policy Acquisition Cost |  | Reserve for Losses and Loss Expenses |  | Unearned Premiums |  | Net Premiums Earned |  | Net Investment Income |  | Loss and Loss Expenses |  | Amortization of Deferred Policy Acquisition Cost |  | Other Operating Costs and Expenses |  | Net Premiums Written
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 748,134 |  |  | $ | 15,386,761 |  |  | $ | 5,367,137 |  |  | $ | 9,130,324 |  |  | $ | 793,998 |  |  | $ | 5,689,263 |  |  | $ | 931,748 |  |  | $ | 1,699,703 |  |  | $ | 9,657,121 |
Reinsurance & Monoline Excess | 113,475 |  |  | 3,352,891 |  |  | 555,189 |  |  | 1,270,363 |  |  | 211,628 |  |  | 682,879 |  |  | 107,227 |  |  | 253,120 |  |  | 1,297,346 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 47,209 |  |  | — |  |  | — |  |  | 372,138 |  |  | — |
Total | $ | 861,609 |  |  | $ | 18,739,652 |  |  | $ | 5,922,326 |  |  | $ | 10,400,687 |  |  | $ | 1,052,835 |  |  | $ | 6,372,142 |  |  | $ | 1,038,975 |  |  | $ | 2,324,961 |  |  | $ | 10,954,467 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 651,257 |  |  | $ | 13,786,112 |  |  | $ | 4,779,214 |  |  | $ | 8,369,062 |  |  | $ | 550,084 |  |  | $ | 5,130,909 |  |  | $ | 935,469 |  |  | $ | 1,430,456 |  |  | $ | 8,784,146 |
Reinsurance & Monoline Excess | 112,229 |  |  | 3,225,111 |  |  | 518,440 |  |  | 1,192,367 |  |  | 194,272 |  |  | 730,841 |  |  | 103,434 |  |  | 235,836 |  |  | 1,219,924 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 34,829 |  |  | — |  |  | — |  |  | 256,310 |  |  | — |
Total | $ | 763,486 |  |  | $ | 17,011,223 |  |  | $ | 5,297,654 |  |  | $ | 9,561,429 |  |  | $ | 779,185 |  |  | $ | 5,861,750 |  |  | $ | 1,038,903 |  |  | $ | 1,922,602 |  |  | $ | 10,004,070 |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 566,718 |  |  | $ | 12,379,395 |  |  | $ | 4,348,171 |  |  | $ | 7,077,708 |  |  | $ | 468,821 |  |  | $ | 4,326,403 |  |  | $ | 830,199 |  |  | $ | 1,202,192 |  |  | $ | 7,743,814 |
Reinsurance & Monoline Excess | 109,427 |  |  | 3,011,493 |  |  | 498,989 |  |  | 1,028,323 |  |  | 175,324 |  |  | 627,557 |  |  | 131,429 |  |  | 174,098 |  |  | 1,119,053 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 27,473 |  |  | — |  |  | — |  |  | 261,352 |  |  | — |
Total | $ | 676,145 |  |  | $ | 15,390,888 |  |  | $ | 4,847,160 |  |  | $ | 8,106,031 |  |  | $ | 671,618 |  |  | $ | 4,953,960 |  |  | $ | 961,628 |  |  | $ | 1,637,642 |  |  | $ | 8,862,867 |
__________________________ See Report of Independent Registered Public Accounting Firm.

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- Definition The entire disclosure for supplementary insurance information by segment. Includes, but is not limited to, deferred policy acquisition cost; future policy benefit, loss, claim and loss expenses; unearned premium; other policy claim and benefit payable; premium revenue; net investment income; benefit, claim, loss and settlement expenses; amortization of deferred policy acquisition cost; other operating expense; and premium written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column J)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-1 + Details
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