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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue recognition: |  |  |
Shipping and handling costs | $ 43,973 | $ 40,629 | $ 42,619
Cash and cash equivalents: |  |  |
Maximum original maturity period of temporary cash investments classified as cash equivalents | 3 months |  |
Investments: |  |  |
Marketable securities, maximum maturity period | 3 years |  |
Inventories: |  |  |
Inventories at cost, last-in, first-out (LIFO) method | $ 51,694 | 53,278 |
Excess of current cost over LIFO cost of inventories | 18,825 | 17,574 |
Foreign inventories at cost, first-in, first-out (FIFO) method | $ 4,423 | $ 4,253 |

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