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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration of Risk      
Selling, marketing and administrative expenses $ 112,117 $ 127,802 $ 117,691
Cash and cash equivalents:      
Cash and cash equivalents $ 166,841 138,960  
Investments:      
Marketable securities, maximum maturity period 3 years    
Inventories:      
Inventories at cost, last-in, first-out (LIFO) method $ 54,935 55,409  
Excess of current cost over LIFO cost of inventories 19,339 19,174  
Foreign inventories at cost, first-in, first-out (FIFO) method 4,644 3,679  
Foreign Banks      
Cash and cash equivalents:      
Cash and cash equivalents $ 8,303 9,415  
Royalty | Maximum      
Concentration of Risk      
Revenues (as a percent) 0.20%    
Rental | Maximum      
Concentration of Risk      
Revenues (as a percent) 1.00%    
Shipping and Handling      
Concentration of Risk      
Selling, marketing and administrative expenses $ 42,593 $ 49,288 $ 49,527