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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Securitization program) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Apr. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Arrangements        
Borrowings under accounts receivable securitization program   $ 10,000    
Accounts receivable securitization program        
Financing Arrangements        
Maximum borrowing capacity     $ 125,000 $ 100,000
Additional borrowing capacity that may be requested     $ 25,000  
Borrowings under accounts receivable securitization program $ 10,000      
Amount outstanding   45,000    
Outstanding letters of credit   19,000    
Remaining borrowing capacity   $ 61,000