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SIGNIFICANT ACCOUNTING POLICIES: (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue recognition: |  |  |
Shipping and handling costs | $ 42,619 | $ 46,525 | $ 45,367
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 | $ 58,413 | 65,545 |
Excess of current cost over LIFO cost of inventories | 16,864 | 18,117 |
Foreign inventories at cost, first-in, first-out (FIFO) method | $ 3,850 | $ 4,834 |

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