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DEBT (Schedule of Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Oct. 20, 2016 | Apr. 01, 2015
Long-term debt |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | $ 715,567 | $ 712,414 |  |
Less current portion | 111 | 112 |  |
Long-term debt, less current portion (Note 12) | 715,456 | 712,302 |  |
Short-term debt |  |  |  |
Amounts due banks | 2,623 | 34,857 |  |
Current portion of long-term debt (Note 9) | 111 | 112 |  |
Total short-term debt | 2,734 | 34,969 |  |
Total debt | $ 718,190 | $ 747,271 |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 17.90% | 4.90% |  |
Senior Notes 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 350,000
Weighted Average [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Term | 13 years 4 months 24 days |  |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, Weighted Average Interest Rate | 3.30% |  |  |
Debt Issuance Cost | $ 1,178 | $ 1,282 |  |
Long-term debt |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 704,886 | 701,681 |  |
Other borrowings due through 2023, interest up to 2.0% |  |  |  |
Long-term debt |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 10,681 | $ 10,733 |  |
Senior Notes 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 350,000 |
us-gaap_OtherLinesOfCredit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity under the line of credit | 81,785 |  |  |
Short-term debt |  |  |  |
Line of Credit, Current | $ 2,623 |  |  |
Minimum | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.80% |  |  |
Maximum | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |
Maximum | Other borrowings due through 2023, interest up to 2.0% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% | 2.00% |  |
Senior Notes Series A [Member] | Senior Notes 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |
Debt Instrument, Maturity Date | Aug. 20, 2025 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.15% |  |  |
Senior Notes Series A [Member] | Senior Notes 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |
Debt Instrument, Maturity Date | Oct. 20, 2028 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  |  |
Senior Notes Series B [Member] | Senior Notes 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |
Debt Instrument, Maturity Date | Aug. 20, 2030 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.35% |  |  |
Senior Notes Series B [Member] | Senior Notes 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |
Debt Instrument, Maturity Date | Oct. 20, 2033 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.03% |  |  |
Senior Notes Series C [Member] | Senior Notes 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |  |
Debt Instrument, Maturity Date | Apr. 01, 2035 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.61% |  |  |
Senior Notes Series C [Member] | Senior Notes 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |
Debt Instrument, Maturity Date | Oct. 20, 2037 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.27% |  |  |
Senior Notes Series D [Member] | Senior Notes 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |
Debt Instrument, Maturity Date | Apr. 01, 2045 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.02% |  |  |
Senior Notes Series D [Member] | Senior Notes 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |  |
Debt Instrument, Maturity Date | Oct. 20, 2041 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.52% |  |  |
Interest Rate Swap [Member] | Senior Notes [Member] |  |  |  |
Short-term debt |  |  |  |
Derivative, Notional Amount |  | $ 50,000 |  |
Interest Rate Swap [Member] | Minimum | Senior Notes [Member] |  |  |  |
Short-term debt |  |  |  |
Derivative, Variable Interest Rate |  | 2.40% |  |
Interest Rate Swap [Member] | Maximum | Senior Notes [Member] |  |  |  |
Short-term debt |  |  |  |
Derivative, Variable Interest Rate |  | 2.60% |  |
Designated as Hedging Instruments | Interest Rate Swap [Member] |  |  |  |
Short-term debt |  |  |  |
Derivative, Notional Amount | $ 100,000 | $ 50,000 |  |

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