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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Investments:    
Fixed maturities, cost $ 222,428 $ 212,544
Equity securities , cost 10,918 10,918
Other invested assets, cost 5,663 5,626
Receivables:    
Insurance premiums and other, allowance for doubtful accounts $ 223 $ 209
Shareholders' equity:    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred stock, shares authorized (in shares) 4,000,000 4,000,000
Preferred stock, shares issued (in shares) 55,000 55,000
Preferred stock, shares outstanding (in shares) 55,000 55,000
Preferred stock, redemption value $ 5,500 $ 5,500
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 22,400,894 22,400,894
Common stock, shares outstanding (in shares) 20,372,444 20,449,531
Treasury stock, at cost (in shares) 2,028,450 1,951,363