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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 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 867,249 | $ 855,284
Percentage of Total Fair Value | 100.00% | 100.00%
AAA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 388,197 | $ 372,442
Percentage of Total Fair Value | 44.80% | 43.60%
AA [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 95,823 | $ 99,103
Percentage of Total Fair Value | 11.00% | 11.60%
A [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 242,406 | $ 238,766
Percentage of Total Fair Value | 28.00% | 27.90%
BBB [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 136,794 | $ 143,889
Percentage of Total Fair Value | 15.80% | 16.80%
BB and Below [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 242 | $ 0
Percentage of Total Fair Value | 0.00% | 0.00%
Not Rated Available [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 3,787 | $ 1,084
Percentage of Total Fair Value | 0.40% | 0.10%

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