Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturities, Available-for-sale securities, amortized cost	$ 1,659,760	$ 1,761,289
Fixed maturities, Trading securities, at amortized cost	11,941	11,277
Equity securities, cost	67,529	64,819
Allowance for doubtful accounts	1,239	785
Property and equipment, accumulated depreciation	$ 50,183	$ 39,894
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	25,015,963	25,097,408
Common stock, shares outstanding (in shares)	25,015,963	25,097,408