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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Fixed maturity securities, fair value	$ 626,603	$ 616,772
Fixed maturity securities, amortized cost	424,270	479,772
Equity securities, cost	$ 24,082	$ 19,962
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	20,558,559	20,528,230
Common stock, shares outstanding	19,300,309	19,269,980
Treasury stock, shares	1,258,250	1,258,250

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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