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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

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