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Disclosures about fair value of financial instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Cash equivalents $ 106,856 $ 49,038
Short-term Investments 0 25
Derivatives 122,603 58,107
Total Assets 229,459 107,170
Liabilities    
Derivatives 20,525 14,037
Total Liabilities 20,525 14,037
Quoted Prices in Active Markets For Identical Assets (Level 1)    
Assets    
Cash equivalents 106,856 49,038
Short-term Investments 0 25
Derivatives 0 0
Total Assets 106,856 49,063
Liabilities    
Derivatives 0 0
Total Liabilities 0 0
Significant Other Observable Inputs (Level 2)    
Assets    
Cash equivalents 0 0
Short-term Investments 0 0
Derivatives 122,603 58,107
Total Assets 122,603 58,107
Liabilities    
Derivatives 20,525 14,037
Total Liabilities 20,525 14,037
Significant Unobservable Inputs (Level 3)    
Assets    
Cash equivalents 0 0
Short-term Investments 0 0
Derivatives 0 0
Total Assets 0 0
Liabilities    
Derivatives 0 0
Total Liabilities $ 0 $ 0