CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Fixed maturities, amortized cost | $ 669,363 | $ 630,688 |
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares issued (in shares) | 59,858,418 | 59,145,161 |
| Common stock, shares outstanding (in shares) | 59,858,418 | 59,145,161 |
| Common stock, shares authorized (in shares) | 250,000,000 | 250,000,000 |