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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Fixed income securities, held-to-maturity, fair value | $ 38,317 | $ 44,100
Fixed income securities, available-for-sale, amortized cost | 5,270,798 | 5,076,716
Equity securities, cost |  | 143,811
Equity Securities, FV-NI, Cost | 138,114 |
Premiums receivable, allowance for uncollectible accounts | 9,400 | 10,000
Reinsurance recoverable, allowance for uncollectible accounts | 4,500 | 4,600
Property and equipment, accumulated depreciation and amortization | $ 211,657 | $ 213,227
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 | 102,848,394 | 102,284,564
Treasury stock, shares | 43,899,840 | 43,789,442

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