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SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue recognition |  |  |
Shipping and handling costs | $ 45,072 | $ 45,850 | $ 43,034
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 | 58,439 | 67,339 |
Excess of current cost over LIFO cost of inventories | 26,130 | 24,043 |
Foreign inventories at cost, first-in, first-out (FIFO) method | $ 3,944 | $ 4,421 |
Net product sales | A major customer |  |  |
Major customers |  |  |
Revenues from a major customer (as a percent) | 23.50% | 23.30% | 21.40%

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