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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 123,110
Due after one year through five years	401,175
Due after five years through ten years	286,921
Due after ten years	14,533
Perpetual maturity securities	5,388
Amortized Cost	831,127	$ 653,715
Fair Value
Due in one year or less	122,333
Due after one year through five years	395,735
Due after five years through ten years	283,350
Due after ten years	13,864
Perpetual maturity securities	5,156
Fair Value	$ 820,438	$ 649,334

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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