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FINANCING ARRANGEMENTS - Components of Short-term and Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 1,341,605 $ 1,346,352
Less: Current maturities and short-term borrowing 0 (5,000)
Long-term debt $ 1,341,605 $ 1,341,352
Line of Credit | Revolving credit facility | Revolving credit facility    
Debt Instrument [Line Items]    
Average interest rate as of 0.00% 3.64%
Total debt $ 0 $ 5,000
Senior Notes | Series A Notes    
Debt Instrument [Line Items]    
Average interest rate as of 3.97% 3.97%
Total debt $ 175,000 $ 175,000
Senior Notes | Series B Notes    
Debt Instrument [Line Items]    
Average interest rate as of 4.26% 4.26%
Total debt $ 150,000 $ 150,000
Senior Notes | Series C Notes    
Debt Instrument [Line Items]    
Average interest rate as of 4.60% 4.60%
Total debt $ 175,000 $ 175,000
Secured Debt | Receivables securitization facility    
Debt Instrument [Line Items]    
Average interest rate as of 3.14% 3.15%
Total debt $ 249,788 $ 249,744
Unsecured Debt | Senior Notes    
Debt Instrument [Line Items]    
Average interest rate as of 4.20% 4.20%
Total debt $ 591,817 $ 591,608