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DEBT (Details)
$ in Thousands, ¥ in Billions
 3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2016
JPY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
JPY (¥)
Debt Facilities [Abstract]        
Current portion of long-term debt $ 94,697   $ 67,849  
Debt discount $ 4,000      
Maximum [Member]        
Debt Facilities [Abstract]        
Consolidated leverage ratio 2.25      
Minimum [Member]        
Debt Facilities [Abstract]        
Consolidated interest coverage ratio 3.00      
Term Loan Facility [Member]        
Debt Facilities [Abstract]        
Original principal amount $ 127,500      
Balance $ 116,300 [1],[2]   118,700  
Interest rate Variable 30 day: 2.69      
Interest rate 2.69% 2.69%    
Repayment terms One half of the principal amount payable in increasing quarterly installments over a five-year period that began on December 31, 2014, with the remainder payable at the end of the five-year term.      
Term 5 years      
Current portion of long-term debt $ 73,700      
Japanese Yen Term Loan Facility [Member]        
Debt Facilities [Abstract]        
Original principal amount | ¥   ¥ 6.6    
Balance $ 53,400 [1],[2] ¥ 6.0 [1],[2] 51,100 ¥ 6.1
Interest rate Variable 30 day: 2.25      
Interest rate 2.25% 2.25%    
Repayment terms One half of the principal amount payable in increasing quarterly installments over a five-year period that began on December 31, 2014, with the remainder payable at the end of the five-year term.      
Term 5 years      
Current portion of long-term debt $ 5,100      
Revolving Credit Facility [Member]        
Debt Facilities [Abstract]        
Borrowing capacity 187,500      
Balance $ 62,500 [1],[2]   47,500  
Interest rate Variable 30 day: 2.69      
Interest rate 2.69% 2.69%    
Repayment terms Revolving line of credit expires October 2019.      
Korea Subsidiary Loan [Member]        
Debt Facilities [Abstract]        
Original principal amount $ 20,000      
Balance $ 20,000 [1],[2]   20,000  
Interest rate 1.12% 1.12%    
Repayment terms One half of the principal amount payable on March 17, 2017 and the remainder payable on March 16, 2018.      
Current portion of long-term debt $ 10,000      
Japan Subsidiary Loan [Member]        
Debt Facilities [Abstract]        
Original principal amount | ¥   ¥ 2.0    
Balance $ 14,800 [1],[2] ¥ 1.7 [1],[2] $ 16,600 ¥ 2.0
Interest rate 0.66% 0.66%    
Repayment terms Payable in semi-annual installments over three years that began on January 31, 2016.      
Term 3 years      
Current portion of long-term debt $ 5,900      
[1] As of March 31, 2016, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $73.7 million of the balance of its U.S. dollar-denominated debt under the Credit Agreement term loan facility, $5.1 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility, $10.0 million of the Korea subsidiary loan and $5.9 million of the Japan subsidiary loan. The Company has classified the amount borrowed under the Credit Agreement revolving credit facility as short term because it is the Company's intention to use this line of credit to borrow and pay back funds over short periods of time.
[2] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $4.0 million, which is not reflected in this table.