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Schedule III - Supplementary Insurance Information
 12 Months Ended
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 Excess112,229 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 Excess109,427 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 Excess88,297 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 
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See Report of Independent Registered Public Accounting Firm.