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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 878,567 | $ 820,438
Percentage of Total Fair Value | 100.00% | 100.00%
AAA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 406,441 | $ 388,672
Percentage of Total Fair Value | 46.30% | 47.40%
AA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 93,687 | $ 100,791
Percentage of Total Fair Value | 10.70% | 12.30%
A [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 232,352 | $ 214,503
Percentage of Total Fair Value | 26.40% | 26.10%
BBB [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 141,837 | $ 112,613
Percentage of Total Fair Value | 16.10% | 13.70%
BB and Below [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 0 | $ 494
Percentage of Total Fair Value | 0.00% | 0.10%
Not Rated Available [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 4,250 | $ 3,365
Percentage of Total Fair Value | 0.50% | 0.40%

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