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Marketable Securities - Maturities (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Amortized Cost  
Maturing in one year or less $ 237,736
Maturing after one year 277,426
Total amortized cost 515,162
Estimate Fair Value  
Maturing in one year or less 236,605
Maturing after one year 276,228
Total estimated fair value $ 512,833