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Investments - Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Available-for-sale, Amortized Cost
Within 1 year	$ 216,084
After 1 year through 5 years	189,654
Amortized Cost	405,738
Available-for-sale, Estimated Fair Value
Within 1 year	216,764
After 1 year through 5 years	190,246
Total	407,010
Held-to-maturity, Amortized Cost
Within 1 year	1,820
After 1 year through 5 years	1,667
Total	3,487
Held-to-maturity, Estimated Fair Value
Within 1 year	1,820
After 1 year through 5 years	1,769
Total	$ 3,589

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