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Fair value measurements - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities, FV-NI, unrealized gain (loss) $ (17,700) $ 2,300 $ (143,500)
Fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 59,081 38,367  
Loans receivable 329,650 403,378  
Notes receivable 486,223 616,883  
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 59,081 38,367  
Level 1 | Fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 39,081 38,367  
Loans receivable 0 0  
Notes receivable 0 0  
Level 1 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 39,081 38,367  
Level 3 | Fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 20,000 0  
Loans receivable 329,650 403,378  
Notes receivable 486,223 616,883  
Level 3 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 20,000 0  
Level 3 | Fair Value, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans receivable 329,700 403,400  
Notes receivable $ 486,200 $ 616,900