Consolidated Balance Sheets - (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities available-for-sale, amortized cost	$ 514,237	$ 422,255
Equity securities - cost	$ 56,051
Equity securities available-for-sale, cost		$ 45,916
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	21,241,504	21,036,087
Common stock, shares outstanding (in shares)	21,241,504	21,036,087