DEBT (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Long-term debt
Carrying value of long-term debt	$ 717,855	$ 715,567
Less current portion	766	111
Long-term debt, less current portion (Note 9)	717,089	715,456
Short-term debt
Amounts due banks	51,964	2,623
Current portion of long-term debt (Note 9)	766	111
Total short-term debt	52,730	2,734
Total debt	$ 769,819	$ 718,190
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.80%	17.90%
Weighted Average [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	12 years 4 months 24 days
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.30%
Debt Issuance Cost	$ 1,074	$ 1,178
Long-term debt
Carrying value of long-term debt	704,313	704,886
Other borrowings due through 2023, interest up to 2.0%
Long-term debt
Carrying value of long-term debt	13,542	$ 10,681
us-gaap_OtherLinesOfCredit [Member]
Debt Instrument [Line Items]
Borrowing capacity under the line of credit	91,309
Short-term debt
Line of Credit, Current	$ 11,964
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	2.20%	2.20%
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%