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Investments - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |
Other investments, at cost | $ 42,990 | $ 26,654
Debt Securities, Available-for-sale, Restricted | $ 460,700 | $ 433,700
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% | 10.00%
Mortgage-backed securities, weighted average life | 4 years |

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