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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Marketable Securities |
Schedule for available-for-sale securities | The following is a summary of available-for-sale securities as of September 30, 2018 (in thousands):
| September 30, 2018
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value
Tax-exempt municipal securities | $ | 21,366 |  | $ | 1 |  | $ | (69) |  | $ | 21,298
Corporate debt securities |  | 41,730 |  |  | 7 |  |  | (272) |  |  | 41,465
Variable rate demand notes |  | 8,700 |  |  | - |  |  | - |  |  | 8,700
Total | $ | 71,796 |  | $ | 8 |  | $ | (341) |  | $ | 71,463
Schedule of maturities of marketable securities | The following table summarizes the maturities of the Company’s marketable securities as of September 30, 2018 (in thousands):
|  | September 30, 2018
Due within one year | $ | 38,139
Due after one year through five years |  | 33,324
Total | $ | 71,463

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