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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Long-term debt and credit facilities, overview (Details)
$ in Thousands, € in Millions
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Overview [Abstract]      
Debt Issuance Costs, Noncurrent, Net $ (6,157)   $ (7,277)
Senior Notes 589,453   590,777
Long term debt overview [Abstract]      
Long-term Debt, Fair Value 575,753   597,423
2021 Euro Loan [Member]      
Overview [Abstract]      
Debt Instrument, Face Amount 67,600 € 60.3  
Debt Issuance Costs, Noncurrent, Net [1] (71)    
Senior Notes 67,493   67,683
Long term debt overview [Abstract]      
Long-term Debt, Fair Value 66,817   68,120
2023 Euro Loan [Member]      
Overview [Abstract]      
Debt Instrument, Face Amount 524,962 € 468.8  
Debt Issuance Costs, Noncurrent, Net [1] (3,002)    
Senior Notes 521,960   523,094
Long term debt overview [Abstract]      
Long-term Debt, Fair Value 508,936   $ 529,303
2023 Revolving Credit Facility [Member]      
Overview [Abstract]      
Debt Issuance Costs, Noncurrent, Net [1] 0    
Long-term Line of Credit, Noncurrent 0    
Senior Debt and Credit Facilities [Member]      
Overview [Abstract]      
Debt Instrument, Face Amount 592,526    
Debt Issuance Costs, Noncurrent, Net [1] (3,073)    
Senior Notes $ 589,453    
[1]
(1) 
Debt issuance costs related to the 2021 Euro Loan, the 2023 Euro Loan and the 2023 Revolving Credit Facility (each as defined below) are being amortized on a straight-line basis, which approximates the effective interest method, over the life of the respective instruments. Debt issuance costs related to the 2023 Revolving Credit Facility are classified as non-current assets in our condensed consolidated balance sheet