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Investments - Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Available-for-sale, Amortized Cost
Within 1 year	$ 194,815
After 1 year through 5 years	211,785
Amortized Cost	406,600
Available-for-sale, Estimated Fair Value
Within 1 year	195,149
After 1 year through 5 years	212,195
Total	407,344
Held-to-maturity, Amortized Cost
Within 1 year	3,487
Total	3,487
Held-to-maturity, Estimated Fair Value
Within 1 year	3,692
Total	$ 3,692

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