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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Additional Information (Details)
€ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Feb. 29, 2016
USD ($)
Line of Credit Facility [Line Items]              
Borrowing capacity             $ 600,000,000
Commitment fee percentage 0.50%            
Percentage of equity interests of material first-tier foreign subsidiaries guaranteed to the line of credit facility 65.00% 65.00%          
Ratio of Senior Secured Debt To EBITDA 2.63 2.63          
Interest Coverage Ratio 2.78 2.78          
Cash on hand $ 15,084,000   $ 18,288,000 $ 18,183,000 $ 26,552,000    
Available borrowing capacity 58,000,000            
Net Investment Hedge              
Line of Credit Facility [Line Items]              
Borrowing under credit facility $ 13,800,000 € 12.3          
LIBOR              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 3.00%            
Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity $ 300,000,000           400,000,000
Debt term 5 years            
Term Loan Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity             $ 200,000,000
Debt term 5 years            
Swing Line Facility              
Line of Credit Facility [Line Items]              
Borrowing capacity $ 35,000,000            
Standby Letters of Credit              
Line of Credit Facility [Line Items]              
Outstanding letters of credit $ 22,000,000   $ 22,800,000        
March 31, 2019              
Line of Credit Facility [Line Items]              
Maximum ratio of senior secured debt to consolidated EBITDA 3.50 3.50          
June 30, 2019              
Line of Credit Facility [Line Items]              
Maximum ratio of senior secured debt to consolidated EBITDA 3.50 3.50          
September 30, 2019 and thereafter              
Line of Credit Facility [Line Items]              
Maximum ratio of senior secured debt to consolidated EBITDA 2.75 2.75          
March 31, 2019 and thereafter              
Line of Credit Facility [Line Items]              
Minimum interest coverage ratio 2.50 2.50          
Convertible debt              
Line of Credit Facility [Line Items]              
Principal amount, long-term debt issued           $ 230,000,000  
Interest rate on convertible debt 5.00% 5.00%       5.00%  
Credit Facility              
Line of Credit Facility [Line Items]              
Unamortized issuance costs $ 1,600,000