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FAIR VALUE MEASUREMENTS (Details 4) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Liabilities |  |
Derivatives | $ 290 | $ 367
Recurring basis | Level 1 |  |
Assets |  |
Total | 5,807 | 8,079
Recurring basis | Level 1 | Money market funds |  |
Assets |  |
Total | 5,807 | 8,079
Recurring basis | Level 2 |  |
Assets |  |
Total | 138,812 | 54,440
Recurring basis | Level 2 | Government-sponsored enterprise securities |  |
Assets |  |
Total | 4,593 | 7,369
Recurring basis | Level 2 | Commercial paper |  |
Assets |  |
Total | 13,998 | 5,499
Recurring basis | Level 2 | Corporate notes |  |
Assets |  |
Total | 120,221 | 41,572
Recurring basis | Level 3 |  |
Liabilities |  |
Derivatives | 290 | 367
Recurring basis | Total |  |
Assets |  |
Total | 144,619 | 62,519
Liabilities |  |
Derivatives | 290 | 367
Recurring basis | Total | Money market funds |  |
Assets |  |
Total | 5,807 | 8,079
Recurring basis | Total | Government-sponsored enterprise securities |  |
Assets |  |
Total | 4,593 | 7,369
Recurring basis | Total | Commercial paper |  |
Assets |  |
Total | 13,998 | 5,499
Recurring basis | Total | Corporate notes |  |
Assets |  |
Total | $ 120,221 | $ 41,572

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