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Financial instruments fair value - Changes in Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 10,100 $ 8,200
Additions 0 359
Net loss 88 300
Payments (4,588) 0
Other 0 (60)
Balance, end of period $ 5,600 $ 8,799