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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 27, 2018 | Oct. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |
Long-term asset |  |  | $ 64,526 | $ 604 |
Tax expense |  |  | 5,471 | 45,652 | $ 20,528
Withholding and interest for licencing and royalty payments |  | $ 13,200 |  |  |
Withholding and interest for licencing and royalty payments period |  | 3 years |  |  |
Current income tax expense |  |  | $ 8,677 | 15,406 | 12,902
State and foreign income tax returns subject to examination period minimum (in years) |  |  | 3 years |  |
State and foreign income tax returns subject to examination period maximum (in years) |  |  | 4 years |  |
Korean Government [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  | $ (36,900) |  |
U.S.Federal Government [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes |  |  | 16,200 |  |
South Korea [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Current income tax expense |  |  | 14,900 | $ 17,600 | $ 14,400
Reduction of Korean Withholding Taxes [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Reduction of deferred tax asset for foreign tax credits and R&D |  |  | $ 20,700 |  |
Allocation of Withholding to Non-Korean Patents [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Long-term asset | $ 13,600 |  |  |  |
Allocation of Withholding to Korean Patents [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax expense | $ 1,300 |  |  |  |

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