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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Long-term debt and credit facilities, overview (Details)
$ in Thousands, € in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Apr. 07, 2016
EUR (€)
Overview [Abstract]        
Debt Issuance Costs, Noncurrent, Net $ (8,928)   $ (9,660)  
Senior Notes 690,883   772,339  
Long term debt overview [Abstract]        
Long-term Debt, Fair Value 667,673   735,675  
2021 Euro Loan [Member]        
Overview [Abstract]        
Debt Instrument, Face Amount 168,902 € 150.3    
Debt Issuance Costs, Noncurrent, Net [1] (344)      
Senior Notes 168,558   240,296  
Long term debt overview [Abstract]        
Long-term Debt, Fair Value 164,943   233,058  
2023 Euro Loan [Member]        
Overview [Abstract]        
Debt Instrument, Face Amount 526,697     € 468.8
Debt Issuance Costs, Noncurrent, Net [1] (4,372)      
Senior Notes 522,325   532,043  
Long term debt overview [Abstract]        
Long-term Debt, Fair Value 502,730   $ 502,617  
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 695,599      
Debt Issuance Costs, Noncurrent, Net [1] (4,716)      
Senior Notes $ 690,883      
[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