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FINANCING ARRANGEMENTS - Components of Short-term and Long-term Debt (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Total debt | $ 1,407,054 | $ 1,465,000
Less: Current maturities and short-term borrowing | (66,000) | (715,000)
Long-term debt | $ 1,341,054 | $ 750,000
Line of Credit | Revolving credit facility | Senior Unsecured Revolving Credit Facility 2019 Term Loan |  |
Debt Instrument [Line Items] |  |
Average interest rate as of | 3.68% | 2.70%
Total debt | $ 66,000 | $ 715,000
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 | 2.87% | 2.00%
Total debt | $ 249,854 | $ 250,000
Unsecured Debt | Senior Notes Due 2028 |  |
Debt Instrument [Line Items] |  |
Average interest rate as of | 4.20% |
Total debt | $ 591,200 | $ 0

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