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Fair value measurements - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, at fair value $ 26,016 $ 38,367
Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, at fair value 26,016 38,367
Level 3 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment, at fair value 0 $ 0
Level 3 | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, fair value disclosure 372,200  
Notes receivable, fair value disclosure $ 566,800