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FINANCING ARRANGEMENTS - Components of Short-term and Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt $ 1,343,517 $ 1,093,301
Less: Current maturities and short-term borrowing (250,000) 0
Long-term debt $ 1,093,517 $ 1,093,301
Line of Credit | Revolving credit facility    
Debt Instrument [Line Items]    
Average interest rate (percent) 1.21% 0.00%
Total debt $ 250,000 $ 0
Senior Notes | Senior Notes, Series A    
Debt Instrument [Line Items]    
Average interest rate (percent) 3.97% 3.97%
Total debt $ 175,000 $ 175,000
Senior Notes | Senior Notes, Series B    
Debt Instrument [Line Items]    
Average interest rate (percent) 4.26% 4.26%
Total debt $ 150,000 $ 150,000
Senior Notes | Senior Notes, Series C    
Debt Instrument [Line Items]    
Average interest rate (percent) 4.60% 4.60%
Total debt $ 175,000 $ 175,000
Unsecured Debt | Senior Notes    
Debt Instrument [Line Items]    
Average interest rate (percent) 4.20% 4.20%
Total debt $ 593,517 $ 593,301