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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 106,961
Due after one year through five years	390,128
Due after five years through ten years	313,951
Due after ten years	17,131
Perpetual maturity securities	165
Amortized Cost	828,336	$ 831,127
Fair Value
Due in one year or less	107,259
Due after one year through five years	398,565
Due after five years through ten years	332,068
Due after ten years	17,191
Perpetual maturity securities	201
Fair Value	$ 855,284	$ 820,438

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