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Net realized and unrealized gains (losses) (Tables)
 6 Months Ended
Jun. 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 
 June 30,		Six Months Ended 
 June 30,
 2021202020212020
 ($000 omitted)
Realized gains7,909 1,355 8,080 1,508 
Realized losses— (657)(2,469)(1,347)
Net unrealized investment gains (losses) recognized on equity securities still held at end of period3,745 4,366 9,318 (6,188)
11,654 5,064 14,929 (6,027)
Investments in equity securities still held The total fair values of the Company's investments in debt and equity securities are as follows:
 June 30, 2021December 31, 2020
($000 omitted)
Investments in:
Debt securities635,162 631,386 
Equity securities76,236 53,001 
711,398 684,387 
Investment gains and losses recognized related to investments in equity securities are as follows:
Three Months Ended 
 June 30,		Six Months Ended 
 June 30,
2021202020212020
($000 omitted)
Net investment gains (losses) recognized on equity securities during the period3,780 3,966 9,361 (7,095)
Less: Net realized gains (losses) on equity securities sold during the period35 (400)43 (907)
Net unrealized investment gains (losses) recognized on equity securities still held at end of period3,745 4,366 9,318 (6,188)
Proceeds from sale of investments in securities The total fair values of the Company's investments in debt and equity securities are as follows:
 June 30, 2021December 31, 2020
($000 omitted)
Investments in:
Debt securities635,162 631,386 
Equity securities76,236 53,001 
711,398 684,387 
The amortized costs and fair values of investments in debt securities are as follows:
 June 30, 2021December 31, 2020
 
Amortized
costs
Fair
values
Amortized
costs
Fair
values
 ($000 omitted)
Municipal40,466 42,462 45,138 47,603 
Corporate291,413 305,229 285,962 305,450 
Foreign275,764 280,861 261,748 271,711 
U.S. Treasury Bonds6,570 6,610 6,564 6,622 
614,213 635,162 599,412 631,386 
Proceeds from sales of investments in securities are as follows: 
 Three Months Ended 
 June 30,		Six Months Ended 
 June 30,
 2021202020212020
 ($000 omitted)
Proceeds from sales of debt securities11,634 3,270 14,571 14,773 
Proceeds from sales of equity securities59 433 173 726 
Total proceeds from sales of investments in securities11,693 3,703 14,744 15,499