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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fixed income securities, held-to-maturity, fair value | $ 21,921 | $ 21,975
Fixed income securities, available-for-sale, amortized cost | 5,877,779 | 5,879,986
Fixed income securities, available-for-sale, allowance for credit losses | 15,787 | 0
Commercial mortgage loans, fair value | 13,856 | 0
Equity securities, cost | 116,249 | 72,061
Property and equipment - at cost, accumulated depreciation and amortization | $ 231,651 | $ 227,566
Preferred stock, par value per share | $ 0 | $ 0
Preferred stock, shares authorized | 5,000,000 | 5,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value per share | $ 2 | $ 2
Common stock, shares authorized | 360,000,000 | 360,000,000
Common stock, shares issued | 103,832,370 | 103,484,159
Treasury stock - at cost, shares | 44,124,825 | 44,023,006

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