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DEBT (Details - Convertible Senior Notes) $ / shares in Units, $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
May 31, 2017 USD ($) day $ / shares Rate shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount of convertible senior notes | $ 300,000 | $ 300,000 |  | $ 300,000
Annual interest rate on convertible senior notes | Rate | 0.625% |  |  |
Initial conversion rate, shares per $1,000 principal amount of notes | shares | 4.8163 |  |  |
Initial conversion price per share | $ / shares | $ 207.63 |  |  |
Conversion rate, sales price of common stock as a percentage of the conversion price | Rate | 130.00% |  |  |
Threshold trading days | day | 5 |  |  |
Threshold consecutive trading days | day | 5 |  |  |
Conversion rate, sales price of common stock as a percentage of the conversion price, five business days | Rate | 98.00% |  |  |
Cash repurchase at a price equal to the principal amount of the notes, Percentage | Rate | 100.00% |  |  |
Nonconvertible debt borrowing rate at the date of issuance | Rate | 5.36% |  |  |
Debt component of the principal amount of the Convertible Senior Notes | $ 238,400 |  |  |
Equity component of the principal amount of the Convertible Senior Notes | 61,600 |  |  |
Financing costs related to the issuance of the Convertible Senior Notes | 9,300 |  |  |
Debt issuance costs, liability component | 7,400 | 4,541 |  | 5,252
Debt issuance costs, equity component | $ 1,900 |  |  |
Total interest expense on the Convertible Senior Notes |  | 7,500 | $ 7,200 |
Interest expense recognized associated with the 0.625% coupon rate |  | 900 | 900 |
Amortization of convertible debt discount |  | 5,929 | 5,623 |
Amortization of debt issuance costs |  | 970 | 865 |
Long-term debt |  | 257,582 |  | 250,943
Fair value of the Convertible Senior Notes using a Level 1 observable input |  | 628,300 |  |
Unamortized debt discount |  | 37,877 |  | $ 43,805
Convertible Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amortization of debt issuance costs |  | $ 700 | $ 700 |

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