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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Concentration of Risk      
Selling, marketing and administrative expenses $ 127,802 $ 117,691 $ 121,484
Cash and cash equivalents:      
Cash and cash equivalents $ 138,960 110,899  
Investments:      
Marketable securities, maximum maturity period 3 years    
Inventories:      
Inventories at cost, last-in, first-out (LIFO) method $ 55,409 50,338  
Excess of current cost over LIFO cost of inventories 19,174 17,062  
Foreign inventories at cost, first-in, first-out (FIFO) method 3,679 4,186  
Foreign Banks      
Cash and cash equivalents:      
Cash and cash equivalents $ 9,415 15,327  
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 $ 49,288 $ 49,527 $ 44,082