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SIGNIFICANT ACCOUNTING POLICIES (Textual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant accounting policies
Percentage Net Sales Over Time	10.00%
Operating Income (Loss)	$ 282,071	$ 370,910	$ 375,539
Selling, general & administrative expenses	$ 543,802	$ 621,489	$ 627,697
Percentage of LIFO Inventory	35.00%	36.00%	37.00%
Maximum period for which derivative contracts cover currency and commodity exposures (in years)	3 years
Product Warranties
Period of warranty services (in years)	3 years
Stock-Based Compensation
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)	615,302	524,110	324,688
Research and Development
Research and development costs	$ 51,414	$ 56,845	$ 54,168
Bonus
Costs related to the Company's discretionary employee bonus programs	87,407	100,381	$ 123,799
Inventories
Inventory Valuation Reserves	24,351	24,088
Prepaid Expense, Current
Prepaid Expense, Current	19,584	17,437
Interest Rate Swap [Member] | Designated as Hedging Instruments
Significant accounting policies
Notional amount of derivative instruments	$ 100,000	$ 50,000

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