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MARKETABLE SECURITIES (Notes) | 12 Months Ended
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Dec. 31, 2018
Marketable Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | MARKETABLE SECURITIES: 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 |
The weighted average interest rate of investments at December 31, 2018 and 2017, was approximately 2.65% and 1.57%, respectively. As of December 31, 2018 and 2017, there were no individual securities that had been in a continuous loss position for 12 months or greater.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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