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SIGNIFICANT ACCOUNTING POLICIES (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Income Tax Reconciliation Excess Tax Benefits Stock Options	$ 6,276	$ 0	$ 0
Excess Tax Benefit from Share-based Compensation, Operating Activities		$ 9,154
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	$ 0.09
Percentage of LIFO Inventory	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)	157,033	774,502	522,471
Research and Development
Research and development costs	$ 47,899	$ 44,720	$ 47,182
Bonus
Costs related to the Company's discretionary employee bonus programs	97,392	83,620	$ 98,651
Inventories
Inventory Valuation Reserves	27,544	19,252
Prepaid Expense, Current [Abstract]
Prepaid Expense, Current	$ 15,599	$ 12,139

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