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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Available-for-sale Securities Included in Cash Equivalents | Available-for-sale investments included in cash equivalents at the end of each period were as follows (in thousands):
| September 30, 2018 |  | December 31, 2017
| Adjusted Cost |  | Gross Unrealized Losses |  | Fair Value |  | Adjusted Cost |  | Gross Unrealized Losses |  | Fair Value
Municipal bonds and notes | $ | 553 |  |  | $ | — |  |  | $ | 553 |  |  | $ | 13,320 |  |  | $ | (1 | ) |  | $ | 13,319 |
Corporate debt securities | 35,857 |  |  | (18 | ) |  | 35,839 |  |  | 49,432 |  |  | (24 | ) |  | 49,408 |
Financial institution instruments | 41,105 |  |  | — |  |  | 41,105 |  |  | 10,881 |  |  | — |  |  | 10,881 |
Total available-for-sale investments | $ | 77,515 |  |  | $ | (18 | ) |  | $ | 77,497 |  |  | $ | 73,633 |  |  | $ | (25 | ) |  | $ | 73,608 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- References No definition available. + Details
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