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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fixed income securities, held-to-maturity, fair value $ 67,716 $ 105,211
Fixed income securities, available-for-sale, amortized cost 5,026,735 4,753,759
Equity securities, available-for-sale, cost 145,984 120,889
Premiums receivable, allowance for uncollectible accounts 7,218 5,980
Reinsurance recoverable, allowance for uncollectible accounts 4,700 5,500
Property and equipment - at cost, accumulated depreciation and amortization $ 211,444 $ 198,729
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 102,180,302 101,620,436
Treasury stock - at cost, shares 43,789,249 43,653,237