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FAIR VALUE (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Oct. 31, 2019
May 31, 2019
Dec. 31, 2018
Liabilities        
Fair value of long-term obligations $ 1,100,000     $ 1,100,000
Reboul        
Liabilities        
Fair value of contingent consideration arrangement       0
Gateway Analytical        
Liabilities        
Fair value of contingent consideration arrangement 3,000   $ 3,000  
Noble        
Liabilities        
Fair value of contingent consideration arrangement 2,900 $ 2,900    
Assets and liabilities measured at fair value on recurring basis | Total        
Assets        
Foreign exchange contracts, assets 206     259
Cross currency swap contract, asset 2,552      
Total assets at fair value 2,758     259
Liabilities        
Foreign exchange contracts, liabilities 401     331
Cross currency swap contract, liability       1,040
Fair value of contingent consideration arrangement 5,930      
Total liabilities at fair value 6,331     1,371
Assets and liabilities measured at fair value on recurring basis | Level 2        
Assets        
Foreign exchange contracts, assets 206     259
Cross currency swap contract, asset 2,552      
Total assets at fair value 2,758     259
Liabilities        
Foreign exchange contracts, liabilities 401     331
Cross currency swap contract, liability       1,040
Fair value of contingent consideration arrangement 0      
Total liabilities at fair value 401     $ 1,371
Assets and liabilities measured at fair value on recurring basis | Level 3        
Liabilities        
Fair value of contingent consideration arrangement 5,930      
Total liabilities at fair value $ 5,930