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Schedule III - Supplementary Insurance Information | 12 Months Ended
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Dec. 31, 2022
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, 2022, 2021 and 2020
(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, 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 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance | $ | 467,871 |  |  | $ | 10,977,674 |  |  | $ | 3,660,758 |  |  | $ | 6,067,669 |  |  | $ | 375,554 |  |  | $ | 3,939,759 |  |  | $ | 734,062 |  |  | $ | 1,137,002 |  |  | $ | 6,347,101 |
Reinsurance & Monoline Excess | 88,297 |  |  | 2,806,756 |  |  | 412,433 |  |  | 863,174 |  |  | 146,029 |  |  | 528,947 |  |  | 170,893 |  |  | 103,775 |  |  | 915,336 |
Corporate, other and eliminations | — |  |  | — |  |  | — |  |  | — |  |  | 62,238 |  |  | — |  |  | — |  |  | 244,660 |  |  | — |
Total | $ | 556,168 |  |  | $ | 13,784,430 |  |  | $ | 4,073,191 |  |  | $ | 6,930,843 |  |  | $ | 583,821 |  |  | $ | 4,468,706 |  |  | $ | 904,955 |  |  | $ | 1,485,437 |  |  | $ | 7,262,437 |
__________________________ 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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574960-122915 + Details
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