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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, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 840,028	$ 820,438
Percentage of Total Fair Value	100.00%	100.00%
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 408,487	$ 388,672
Percentage of Total Fair Value	48.60%	47.40%
AA [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 100,592	$ 100,791
Percentage of Total Fair Value	12.00%	12.30%
A [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 207,422	$ 214,503
Percentage of Total Fair Value	24.70%	26.10%
BBB [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 119,525	$ 112,613
Percentage of Total Fair Value	14.20%	13.70%
BB and Below [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 505	$ 494
Percentage of Total Fair Value	0.10%	0.10%
Not Rated Available [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 3,497	$ 3,365
Percentage of Total Fair Value	0.40%	0.40%

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