CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities available-for-sale, amortized cost	$ 1,258,390	$ 1,253,166
Equity investments, cost	146,520
Equity investments, cost		144,274
Deferred policy acquisition costs from affiliates	42,667	40,848
Affiliated other assets	4,034	4,423
LIABILITIES
Affiliated losses and settlement expenses	732,840	726,413
Unearned premiums from affiliates	257,992	256,434
Affiliated other liabilities	$ 18,493	$ 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)	21,519,498	21,455,545
Common stock, shares outstanding (in shares)	21,519,498	21,455,545