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INCOME TAXES - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes [Line Items] |  |  |  |
Effective income tax rate expense, percent | 14.60% | 23.00% | 8.90% | 22.30%
Income tax expense (benefit) | $ 1,851,000 | $ 14,134,000 | $ 1,635,000 | $ 16,479,000
Korean Government [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes | (37,500,000) |  | (37,500,000) |
U.S.Federal Government [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated settlement amounts due (refunds) from withholding taxes | 18,300,000 |  | 18,300,000 |
Reduction of Korean Withholding Taxes [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Reduction of deferred tax asset for foreign tax credits and R&D |  |  | 19,200,000 |
ASU No. 2016-09 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | $ (448,000) | $ (1,200,000) | $ (1,700,000) | $ (2,400,000)

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