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Schedule of fair value, assets measured on recurring basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Short-term investments | $ 160,014 | $ 126,627
Liabilities: |  |
Foreign currency forward exchange contracts accounted for using hedge accounting | 1,982 |
Foreign currency forward exchange contracts not accounted for using hedge accounting | 63 | 253
Interest rate swaps | (234) |
Total Assets | 1,811 | 126,880
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Short-term investments |  |
Liabilities: |  |
Foreign currency forward exchange contracts accounted for using hedge accounting |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting |  |
Interest rate swaps |  |
Total Assets |  |
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Short-term investments | 160,014 | 126,627
Liabilities: |  |
Foreign currency forward exchange contracts accounted for using hedge accounting | 1,982 |
Foreign currency forward exchange contracts not accounted for using hedge accounting | 63 | 253
Interest rate swaps | (234) |
Total Assets | 1,811 | 126,880
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Short-term investments |  |
Liabilities: |  |
Foreign currency forward exchange contracts accounted for using hedge accounting |  |
Foreign currency forward exchange contracts not accounted for using hedge accounting |  |
Interest rate swaps |  |
Total Assets |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
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