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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Statement of Financial Position [Abstract] |  |
Available-for-sale securities, allowance for credit loss | $ 672 | $ 489
Available for sale debt securities, amortized cost | 1,138,190 | 1,061,192
Equity securities, amortized cost | $ 95,941 | $ 51,151
Cumulative convertible preferred stock, par value (in USD per share) | $ 0.01 | $ 0.01
Cumulative convertible preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000
Cumulative convertible preferred stock, shares issued (in shares) | 10,000 | 10,000
Cumulative convertible preferred stock, shares outstanding (in shares) | 10,000 | 10,000
Cumulative convertible preferred stock, minimum liquidation preference (in USD per share) | $ 9.99 | $ 9.99
Common stock, par value (in USD per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 55,000,000 | 55,000,000
Common stock, shares issued (in shares) | 47,116,000 | 47,018,000
Common stock, shares outstanding (in shares) | 30,716,000 | 31,221,000
Treasury stock, shares (in shares) | 16,400,000 | 15,797,000

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