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Investments - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |
Other investments, at cost | $ 37,885 | $ 26,661
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% | 10.00%
Available-for-sale securities pledged as collateral, fair value | $ 365,300 | $ 500,000
Mortgage-backed securities, weighted average life | 5 years |

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