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Fair value measurements (Financial assets and liabilities measured at fair value on recurring basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets    
Derivative assets $ 16,909 $ 3,303
Liabilities    
Derivative liabilities 71,197 167,303
Recurring    
Assets    
Investment, at fair value 38,367 12,110
Derivative assets 16,909 3,303
Liabilities    
Derivative liabilities 71,197 167,303
Recurring | Level 1    
Assets    
Investment, at fair value 38,367 12,110
Derivative assets 0 0
Liabilities    
Derivative liabilities 0 0
Recurring | Level 2    
Assets    
Investment, at fair value 0 0
Derivative assets 16,909 3,303
Liabilities    
Derivative liabilities 71,197 167,303
Recurring | Level 3    
Assets    
Investment, at fair value 0 0
Derivative assets 0 0
Liabilities    
Derivative liabilities $ 0 $ 0