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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