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Marketable Securities - Maturities (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Amortized Cost
Maturing in one year or less	$ 269,092
Maturing after one year	236,092
Total amortized cost	505,184
Estimate Fair Value
Maturing in one year or less	268,115
Maturing after one year	236,108
Total estimated fair value	$ 504,223

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
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