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DEBT (Schedule of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt
Debt Issuance Cost	$ 853
Long-term debt
Long-term Debt and Capital Lease Obligations, Including Current Maturities	351,803	$ 9,499
Less current portion	1,456	7,011
Long-term debt, less current portion	350,347	2,488
Short-term debt
Amounts due banks, interest at 24.1% (3.1% in 2014)	2,822	61,155
Current portion of long-term debt	1,456	7,011
Total short-term debt	4,278	68,166
Total debt	$ 354,625	70,654
Senior Notes [Member]
Debt
AverageMaturityofDebtInstruments	19 years
Debt, Weighted Average Interest Rate	3.50%
Debt Instrument, Face Amount	$ 350,000
Long-term debt
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 349,147	0
Short-term debt
Interest rate, low end of range (as a percent)	3.20%
Interest rate, high end of range (as a percent)	4.00%
Capital leases due through 2019, interest at 0.3% to 8.0%
Long-term debt
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 111	198
Short-term debt
Interest rate, low end of range (as a percent)	0.30%
Interest rate, high end of range (as a percent)	8.00%
Other borrowings due through 2023, interest up to 18.0%
Long-term debt
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 2,545	$ 9,301
Short-term debt
Interest rate, high end of range (as a percent)	18.00%
Minimum | Senior Notes [Member]
Debt
Debt Instrument, Term	10 years
Maximum | Senior Notes [Member]
Debt
Debt Instrument, Term	30 years
Senior Notes Series A [Member]
Debt
Debt Instrument, Face Amount	$ 100,000
Debt Instrument, Maturity Date	Aug. 20, 2025
Debt Instrument, Interest Rate, Stated Percentage	3.15%
Senior Notes Series B [Member]
Debt
Debt Instrument, Face Amount	$ 100,000
Debt Instrument, Maturity Date	Aug. 20, 2030
Debt Instrument, Interest Rate, Stated Percentage	3.35%
Senior Notes Series C [Member]
Debt
Debt Instrument, Face Amount	$ 50,000
Debt Instrument, Maturity Date	Apr. 01, 2035
Debt Instrument, Interest Rate, Stated Percentage	3.61%
Senior Notes Series D [Member]
Debt
Debt Instrument, Face Amount	$ 100,000
Debt Instrument, Maturity Date	Apr. 01, 2045
Debt Instrument, Interest Rate, Stated Percentage	4.02%

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