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Fair value measurements - Measurement of Fair Value of Major Asset and Liability classed (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) $ 1,954 $ 1,713
Available for sale investments (long-term) 41,790 32,631
Total assets 56,855 34,356
Total liabilities 0 3,670
Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 13,111 12
Derivative instruments 0 3,670
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 1,954 1,713
Available for sale investments (long-term) 0 0
Total assets 1,954 1,713
Total liabilities 0 0
Level 1 | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0 0
Derivative instruments 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 0 0
Available for sale investments (long-term) 0 0
Total assets 13,111 12
Total liabilities 0 3,670
Level 2 | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 13,111 12
Derivative instruments 0 3,670
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 0 0
Available for sale investments (long-term) 0 0
Total assets 0 0
Total liabilities 0 0
Level 3 | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0 0
Derivative instruments 0 0
Investments Measured at Net Asset Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities (short-term) 0 0
Available for sale investments (long-term) 41,790 32,631
Total assets 41,790 32,631
Total liabilities 0 0
Investments Measured at Net Asset Value | Interest rate cap and interest rate swap | Total derivatives designated as hedging instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments 0 0
Derivative instruments $ 0 $ 0