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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investments:    
Fixed maturity securities available-for-sale, amortized cost $ 1,264,975 $ 1,253,166
Equity investments, cost 155,734  
Equity investments, cost   144,274
Deferred policy acquisition costs from affiliates 47,323 40,848
Affiliated other assets 4,706 4,423
LIABILITIES    
Affiliated losses and settlement expenses 756,751 726,413
Unearned premiums from affiliates 291,464 256,434
Affiliated other liabilities $ 26,440 $ 27,520
STOCKHOLDERS' EQUITY    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 21,575,286 21,455,545
Common stock, shares outstanding (in shares) 21,575,286 21,455,545