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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