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SEGMENT AND GEOGRAPHIC INFORMATION: Concentration (Details) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Wal-Mart | Net product sales | A major customer |  |  |
Concentration of Risk |  |  |
Revenues from a major customer (as a percent) | 23.70% | 23.70% | 23.80%
McLane |  |  |
Concentration of Risk |  |  |
Revenues from a major customer (as a percent) | 16.70% | 15.30% |
McLane | Net product sales | A major customer |  |  |
Concentration of Risk |  |  |
Revenues from a major customer (as a percent) |  |  | 15.10%

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