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Investments - Contractual Maturity (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Amortized Cost  
Due in 1 year or less $ 200,786
Due in 1-2 years 83,229
Due in 2-5 years 36,201
Cost 320,216
Estimated Fair Value  
Due in 1 year or less 200,171
Due in 1-2 years 82,094
Due in 2-5 years 35,575
Total investments in available-for-sale securities $ 317,840