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Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Short-term investments | $ 67,870 | $ 69,899
Foreign currency forward exchange contracts accounted for using hedge accounting | 179 | 26
Foreign currency forward exchange contracts not accounted for using hedge accounting |  | 119
Total Assets | 68,049 | 70,044
Liabilities: |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting | 45 |
Interest rate swap | 207 | 529
Total Liabilities | 252 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Short-term investments |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting |  |
Total Assets |  |
Liabilities: |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting |  |
Interest rate swap |  |
Total Liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Short-term investments | 67,870 | 69,899
Foreign currency forward exchange contracts accounted for using hedge accounting | 179 | 26
Foreign currency forward exchange contracts not accounted for using hedge accounting |  | 119
Total Assets | 68,049 | 70,044
Liabilities: |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting | 45 |
Interest rate swap | 207 | 529
Total Liabilities | 252 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Short-term investments |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting |  |
Total Assets |  |
Liabilities: |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting |  |
Interest rate swap |  |
Total Liabilities |  |

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