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Net realized and unrealized gains (losses) (Tables)
 3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Gross Realized and Unrealized Gains and Losses Realized and unrealized gains and losses are detailed as follows:
 Three Months Ended 
 March 31,
 20242023
 ($000 omitted)
Realized gains102 61 
Realized losses(291)(747)
Net unrealized investment gains (losses) recognized on equity securities still held
7,227 (1,092)
7,038 (1,778)
Schedule of Investment Gains and Losses Recognized Related to Investments in Equity Securities
Investment gains and losses recognized related to investments in equity securities are as follows:
Three Months Ended 
 March 31,
20242023
($000 omitted)
Net investment gains (losses) recognized on equity securities during the period
7,234 (1,756)
Less: Net realized gains (losses) on equity securities sold during the period
7 (664)
Net unrealized investment gains (losses) recognized on equity securities still held
7,227 (1,092)
Schedule of Proceeds from Sale of Investments in Securities
The amortized costs and fair values of investments in debt securities are as follows:
 March 31, 2024December 31, 2023
 
Amortized
costs
Fair
values
Amortized
costs
Fair
values
 ($000 omitted)
Municipal18,725 18,499 22,201 22,031 
Corporate240,573 228,668 242,656 231,474 
Foreign326,560 315,661 332,723 323,391 
U.S. Treasury Bonds34,948 34,229 33,714 33,340 
620,806 597,057 631,294 610,236 
Proceeds from sales of investments in securities are as follows: 
 Three Months Ended 
 March 31,
 20242023
 ($000 omitted)
Proceeds from sales of debt securities20,767 7,446 
Proceeds from sales of equity securities107 19,326 
Total proceeds from sales of investments in securities20,874 26,772