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SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 Y M | Dec. 31, 2010 | Dec. 31, 2009
Revenue recognition |  |  |
Shipping and handling costs | $ 45,850 | $ 43,034 | $ 38,628
Cash and cash equivalents |  |  |
Maximum original maturity period of temporary cash investments classified as cash equivalents (in months) | 3 |  |
Investments |  |  |
Marketable securities, maximum maturity period (in years) | 3 |  |
Inventories: |  |  |
Inventories at cost, last-in, first-out (LIFO) method | 67,339 | 52,863 |
Excess of current cost over LIFO cost of inventories | 24,043 | 19,379 |
Foreign inventories at cost, first-in, first-out (FIFO) method | $ 4,421 | $ 3,789 |
Net product sales | A major customer |  |  |
Major customers |  |  |
Revenues from a major customer (as a percent) | 23.30% | 21.40% | 22.90%

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