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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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