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Fair value measurements - Measurement of Fair Value of Major Asset and Liability classed (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Available for sale securities (short-term) $ 0 $ 1,954
Investments in equity 53,720 46,804
Equity securities, FV-NI, cost 3,500  
Fair value, recurring    
Assets:    
Available for sale securities (short-term)   1,954
Investments in equity 50,220 46,804
Total assets 50,220 48,758
Liabilities:    
Total liabilities   2,411
Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments | Fair value, recurring    
Liabilities:    
Derivative instruments   2,411
Level 1 | Fair value, recurring    
Assets:    
Available for sale securities (short-term)   1,954
Investments in equity 0 0
Total assets 0 1,954
Liabilities:    
Total liabilities   0
Level 1 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments | Fair value, recurring    
Liabilities:    
Derivative instruments   0
Level 2 | Fair value, recurring    
Assets:    
Available for sale securities (short-term)   0
Investments in equity 0 0
Total assets 0 0
Liabilities:    
Total liabilities   2,411
Level 2 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments    
Liabilities:    
Derivative instruments   2,411
Level 2 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments | Fair value, recurring    
Liabilities:    
Derivative instruments   2,411
Level 3 | Fair value, recurring    
Assets:    
Available for sale securities (short-term)   0
Investments in equity 0 0
Total assets 0 0
Liabilities:    
Total liabilities   0
Level 3 | Fair value, nonrecurring    
Assets:    
Total assets 12,691,200 12,878,000
Level 3 | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments | Fair value, recurring    
Liabilities:    
Derivative instruments   0
Investments Measured at Net Asset Value | Fair value, recurring    
Assets:    
Available for sale securities (short-term)   0
Investments in equity 50,220 46,804
Total assets $ 50,220 46,804
Liabilities:    
Total liabilities   0
Investments Measured at Net Asset Value | Total derivatives designated as hedging instruments | Total derivatives designated as hedging instruments | Fair value, recurring    
Liabilities:    
Derivative instruments   $ 0