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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Condensed Consolidated Balance Sheets    
Available-for-sale, amortized cost $ 1,772,097 $ 1,776,465
Equity securities, cost 234,428 220,373
Premiums and reinsurance balances receivable, allowances for uncollectible amounts 17,055 16,967
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts 9,808 9,793
Property and equipment, accumulated depreciation $ 56,322 $ 54,275
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 67,484,470 67,434,257
Common stock, shares outstanding (in shares) 44,554,256 44,504,043
Treasury stock, shares (in shares) 22,930,214 22,930,214