SIGNIFICANT ACCOUNTING POLICIES (Textual) (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basis of Presentation [Line Items]
Operating Income (Loss)						$ 375,539	$ 376,942	$ 283,614
Cost of goods sold						2,000,153	1,749,324	1,488,055
Selling, general & administrative expenses						627,697	541,225	468,597
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	$ (1,696)	$ (4,232)	$ (758)	$ (2,867)	$ (5,283)
Income Tax Reconciliation Excess Tax Benefits Stock Options						$ 1,094	$ 6,276	$ 0
Percentage of LIFO Inventory	37.00%			32.00%		37.00%	32.00%	40.00%
Maximum period for which derivative contracts cover currency and commodity exposures (in years)						2 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)						324,688	157,033	774,502
Research and Development
Research and development costs						$ 54,168	$ 47,899	$ 44,720
Bonus
Costs related to the Company's discretionary employee bonus programs						123,799	97,392	83,620
Inventories
Inventory Valuation Reserves	$ 24,502			$ 27,544		24,502	27,544
Prepaid Expense, Current [Abstract]
Prepaid Expense, Current	$ 17,078			$ 15,599		$ 17,078	15,599
Adjustments for New Accounting Pronouncement
Basis of Presentation [Line Items]
Operating Income (Loss)							(769)	(4,660)
Cost of goods sold							5,219	2,739
Selling, general & administrative expenses							3,700	$ 1,921
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment							$ (8,150)