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Investments - Maturities (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Adjusted Cost Basis  
Due in one year or less $ 319,137
Due after one year through five years 182,793
Due after five years through 10 years 0
Total 501,930
Estimated Fair Value  
Due in one year or less 319,053
Due after one year through five years 182,631
Due after five years through 10 years 0
Total $ 501,684