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FAIR VALUE MEASUREMENTS (Details 4) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Liabilities |  |
Derivatives | $ 258 | $ 51
Recurring basis | Level 1 |  |
Assets |  |
Total | 5,997 |
Recurring basis | Level 1 | Money market funds |  |
Assets |  |
Total | 5,997 |
Recurring basis | Level 2 |  |
Assets |  |
Total | 56,617 |
Recurring basis | Level 2 | Government-sponsored enterprise securities |  |
Assets |  |
Total | 7,320 |
Recurring basis | Level 2 | Commercial paper |  |
Assets |  |
Total | 15,750 |
Recurring basis | Level 2 | Corporate notes |  |
Assets |  |
Total | 33,547 |
Recurring basis | Level 3 |  |
Liabilities |  |
Derivatives | 258 |
Recurring basis | Total |  |
Assets |  |
Total | 62,614 |
Liabilities |  |
Derivatives | 258 |
Recurring basis | Total | Money market funds |  |
Assets |  |
Total | 5,997 |
Recurring basis | Total | Government-sponsored enterprise securities |  |
Assets |  |
Total | 7,320 |
Recurring basis | Total | Commercial paper |  |
Assets |  |
Total | 15,750 |
Recurring basis | Total | Corporate notes |  |
Assets |  |
Total | $ 33,547 |

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