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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

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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