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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
One-time charge due to enactment of the Tax Cuts and Jobs Act (TCJA) | $ 11,500 |  |  |
Effective income tax rate without TCJA |  | 22.80% |  |
Income tax expense without TCJA |  | $ 34,200 |  |
Current income tax expense |  | $ 15,406 | $ 12,902 | $ 10,224
Withholding tax rate for royalty payments |  | 16.50% |  |
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 |  |
South Korea [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Current income tax expense |  | $ 14,900 | $ 12,400 | $ 9,900
ASU No. 2016-09 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Cumulative effect adjustment on retained earnings resulting from adoption of accounting standard |  | $ 26,500 |  |

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