Investments - Credit losses rollforward (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Credit losses on fixed maturity securities | ||
| Beginning balance | $ 683 | $ 852 |
| Reductions for: Securities sold and paid down | (105) | (139) |
| Ending balance | $ 579 | $ 712 |