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INCOME TAXES - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Taxes [Line Items]        
Effective income tax rate expense, percent 18.90% 18.80% 15.00% 21.60%
Income tax expense (benefit) $ 5,325,000 $ 3,137,000 $ 6,960,000 $ 19,616,000
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) $ (29,000) $ (511,000) $ (1,800,000) $ (2,900,000)