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Investments - Schedule of Credit Quality of Investment Securities With Contractual Maturities or The Issuer of Such Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 820,438 | $ 649,334
Percentage of Total Fair Value | 100.00% | 100.00%
AAA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 388,672 | $ 317,313
Percentage of Total Fair Value | 47.40% | 48.90%
AA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 100,791 | $ 129,573
Percentage of Total Fair Value | 12.30% | 20.00%
A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 214,503 | $ 146,749
Percentage of Total Fair Value | 26.10% | 22.60%
BBB |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 112,613 | $ 51,020
Percentage of Total Fair Value | 13.70% | 7.80%
BB and Below |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 494 | $ 1,569
Percentage of Total Fair Value | 0.10% | 0.20%
No Rating Available |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 3,365 | $ 3,110
Percentage of Total Fair Value | 0.40% | 0.50%

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