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MARKETABLE SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Marketable Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2018, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  |  |  |  |  |  |
Corporate securities | $ | 6,788 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 6,786 |
Total | 6,788 |  |  | — |  |  | (2 | ) |  | 6,786 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 60,123 |  |  | — |  |  | (244 | ) |  | 59,879 |
Total | 60,123 |  |  | — |  |  | (244 | ) |  | 59,879 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 27,806 |  |  | 2 |  |  | (22 | ) |  | 27,786 |
Total | 27,806 |  |  | 2 |  |  | (22 | ) |  | 27,786 |
Total marketable securities | $ | 94,717 |  |  | $ | 2 |  |  | $ | (268 | ) |  | $ | 94,451 |
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2017, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  |  |  |  |  |  |
Corporate securities | $ | 38,485 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 38,469 |
Total | 38,485 |  |  | — |  |  | (16 | ) |  | 38,469 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 104,440 |  |  | — |  |  | (199 | ) |  | 104,241 |
Government securities | 9,302 |  |  | — |  |  | (17 | ) |  | 9,285 |
Total | 113,742 |  |  | — |  |  | (216 | ) |  | 113,526 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 37,436 |  |  | — |  |  | (195 | ) |  | 37,241 |
Total | 37,436 |  |  | — |  |  | (195 | ) |  | 37,241 |
Total marketable securities | $ | 189,663 |  |  | $ | — |  |  | $ | (427 | ) |  | $ | 189,236 |

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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
Name: | us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration