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Net realized and unrealized gains (losses) (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Gross realized investment and other gains and losses Realized and unrealized gains and losses are detailed as follows:
 Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
 2021202020212020
 ($000 omitted)
Realized gains2,615 241 10,695 1,749 
Realized losses(47)(209)(2,516)(1,556)
Net unrealized investment gains (losses) recognized on equity securities still held at end of period319 (39)9,637 (6,228)
2,887 (7)17,816 (6,035)
Investments in equity securities still held The total fair values of the Company's investments in debt and equity securities are as follows:
 September 30, 2021December 31, 2020
($000 omitted)
Investments in:
Debt securities617,278 631,386 
Equity securities83,441 53,001 
700,719 684,387 
Investment gains and losses recognized related to investments in equity securities are as follows:
Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
2021202020212020
($000 omitted)
Net investment gains (losses) recognized on equity securities during the period345 (41)9,706 (7,136)
Less: Net realized gains (losses) on equity securities sold during the period26 (2)69 (908)
Net unrealized investment gains (losses) recognized on equity securities still held at end of period319 (39)9,637 (6,228)
Proceeds from sale of investments in securities The total fair values of the Company's investments in debt and equity securities are as follows:
 September 30, 2021December 31, 2020
($000 omitted)
Investments in:
Debt securities617,278 631,386 
Equity securities83,441 53,001 
700,719 684,387 
The amortized costs and fair values of investments in debt securities are as follows:
 September 30, 2021December 31, 2020
 
Amortized
costs
Fair
values
Amortized
costs
Fair
values
 ($000 omitted)
Municipal38,088 39,885 45,138 47,603 
Corporate280,090 292,119 285,962 305,450 
Foreign274,938 278,808 261,748 271,711 
U.S. Treasury Bonds6,426 6,466 6,564 6,622 
599,542 617,278 599,412 631,386 
Proceeds from sales of investments in securities are as follows: 
 Three Months Ended 
 September 30,		Nine Months Ended 
 September 30,
 2021202020212020
 ($000 omitted)
Proceeds from sales of debt securities4,854 10,218 19,425 24,990 
Proceeds from sales of equity securities128 56 301 782 
Total proceeds from sales of investments in securities4,982 10,274 19,726 25,772