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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, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 842,574	$ 855,284
Percentage of Total Fair Value	100.00%	100.00%
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 368,845	$ 372,442
Percentage of Total Fair Value	43.80%	43.60%
AA [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 74,964	$ 99,103
Percentage of Total Fair Value	8.90%	11.60%
A [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 223,658	$ 238,766
Percentage of Total Fair Value	26.60%	27.90%
BBB [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 172,916	$ 143,889
Percentage of Total Fair Value	20.50%	16.80%
BB and Below [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 1,198	$ 0
Percentage of Total Fair Value	0.10%	0.00%
Not Rated Available [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 993	$ 1,084
Percentage of Total Fair Value	0.10%	0.10%

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