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MARKETABLE SECURITIES (Notes) | 12 Months Ended
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Dec. 31, 2017
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, 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 |
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2016, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  |  |  |  |  |  |
Commercial paper | $ | 36,996 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,996 |
Corporate securities | 9,342 |  |  | 2 |  |  | (2 | ) |  | 9,342 |
Total | 46,338 |  |  | 2 |  |  | (2 | ) |  | 46,338 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Commercial paper | 19,186 |  |  | — |  |  | — |  |  | 19,186 |
Corporate securities | 59,714 |  |  | 15 |  |  | (76 | ) |  | 59,653 |
Total | 78,900 |  |  | 15 |  |  | (76 | ) |  | 78,839 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 63,305 |  |  | 21 |  |  | (180 | ) |  | 63,146 |
Total | 63,305 |  |  | 21 |  |  | (180 | ) |  | 63,146 |
Total marketable securities | $ | 188,543 |  |  | $ | 38 |  |  | $ | (258 | ) |  | $ | 188,323 |
The weighted average interest rate of investments at December 31, 2017 and December 31, 2016, was approximately 1.57% and 1.23%, respectively. As of December 31, 2017 and 2016, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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