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Stockholders' equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Feb. 09, 2023
Dec. 31, 2022
Jan. 27, 2022
Class of Stock [Line Items]                    
Stock options outstanding (shares) 2,501,000     2,501,000     2,684,000      
Stockholders' Equity Attributable to Parent $ 184,679,000 $ 563,479,000 $ 585,150,000 $ 184,679,000 $ 563,479,000 $ 224,912,000 $ 555,846,000   $ 611,559,000  
Stock Repurchase Program, Authorized Amount               $ 40   $ 100
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 60,400,000     $ 60,400,000            
Treasury Stock, Shares, Acquired 0 3,606   0 4,496          
Treasury Stock Acquired, Average Cost Per Share $ 0 $ 4.16   $ 0 $ 4.45          
Stock Repurchased During Period, Value $ 0 $ 15,000,000 5,000,000 $ 0 $ 20,000,000          
Treasury Stock, Value, Acquired, Cost Method   15,000,000 5,000,000              
Treasury Stock, Common                    
Class of Stock [Line Items]                    
Stockholders' Equity Attributable to Parent $ (193,231,000) $ (173,231,000) $ (158,231,000) $ (193,231,000) $ (173,231,000) $ (193,231,000) $ (193,231,000)   $ (153,231,000)  
Common Class A [Member]                    
Class of Stock [Line Items]                    
Common stock authorized (shares) 500,000,000     500,000,000     500,000,000      
Common stock outstanding (shares) 126,471,000     126,471,000     123,638,000      
Common Stock, Voting Rights, Number       1            
Common Stock, Shares, Issued 126,471,000     126,471,000     123,638,000      
Common Class B [Member]                    
Class of Stock [Line Items]                    
Common stock authorized (shares) 150,000,000     150,000,000     150,000,000      
Common stock outstanding (shares) 26,259,000     26,259,000     26,259,000      
Common Stock, Voting Rights, Number       10            
Common Stock, Shares, Issued 26,259,000     26,259,000     26,259,000      
Restricted Stock Units (RSUs) [Member]                    
Class of Stock [Line Items]                    
Restricted stock units outstanding (shares) 13,917,000     13,917,000     11,494,000      
Performance Shares [Member]                    
Class of Stock [Line Items]                    
Restricted stock units outstanding (shares) 1,973,000     1,973,000     829,000