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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Securitization program) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Financing Arrangements        
Long-term debt   $ 291,924 $ 291,924 $ 323,519
Additional borrowings under accounts receivable securitization program     45,000  
Accounts receivable securitization borrowings        
Financing Arrangements        
Maximum borrowing capacity   125,000 125,000  
Additional borrowing capacity that may be requested   25,000 25,000  
Long-term debt       $ 40,000
Additional borrowings under accounts receivable securitization program $ 45,000      
Repayment of accounts receivable securitization   85,000    
Outstanding letters of credit   11,700 11,700  
Remaining borrowing capacity   $ 113,300 $ 113,300