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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Condensed Consolidated Balance Sheets    
Available-for-sale, amortized cost $ 1,776,465 $ 1,646,411
Equity securities, cost 220,373 182,002
Premiums and reinsurance balances receivable, allowances for uncollectible amounts 16,967 16,935
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts 9,793 10,014
Property and equipment, accumulated depreciation $ 54,275 $ 47,676
Common stock, par value (in dollars per share) $ 0.01 $ 1.00
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 67,434,257 67,078,569
Common stock, shares outstanding (in shares) 44,504,043 44,148,355
Treasury stock, shares (in shares) 22,930,214 22,930,214