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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Fixed income securities, held-to-maturity, fair value | $ 21,975 | $ 38,317
Fixed income securities, available-for-sale, amortized cost | 5,879,986 | 5,270,798
Equity securities, cost | 72,061 | 138,114
Premiums receivable, allowance for uncollectible accounts | 6,400 | 9,400
Reinsurance recoverable, allowance for uncollectible accounts | 4,400 | 4,500
Property and equipment, accumulated depreciation and amortization | $ 227,566 | $ 211,657
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 | 103,484,159 | 102,848,394
Treasury stock, shares | 44,023,006 | 43,899,840

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