XML 46 R34.htm IDEA: XBRL DOCUMENT v3.10.0.1
SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Concentration of Risk      
Selling, marketing and administrative expenses $ 117,691 $ 121,484 $ 107,979
Cash and cash equivalents:      
Cash and cash equivalents $ 110,899 96,314  
Investments:      
Marketable securities, maximum maturity period 3 years    
Inventories:      
Inventories at cost, last-in, first-out (LIFO) method $ 50,338 51,694  
Excess of current cost over LIFO cost of inventories 17,062 18,825  
Foreign inventories at cost, first-in, first-out (FIFO) method 4,186 4,423  
Foreign Banks      
Cash and cash equivalents:      
Cash and cash equivalents $ 15,327 22,665  
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 $ 49,527 $ 44,082 $ 40,759