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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]        
Additional income tax expense   $ 14,200    
Reduction of income tax provision due to tax holidays   1,300 $ 1,000  
Unrecognized tax benefits $ 18,157 $ 19,150 $ 22,671 $ 23,972
Expected changes in unrecognized tax benefits in next 12 months that would reduce effective tax rate 500      
Change In Benefits Recorded Against Deferred Tax Items        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits that would decrease effective tax rate if recognized 2,100      
Federal        
Income Tax Contingency [Line Items]        
Tax credits expected to expire unused 100      
State        
Income Tax Contingency [Line Items]        
Tax credits expected to expire unused 7,400      
Foreign        
Income Tax Contingency [Line Items]        
Tax credits expected to expire unused $ 46,100