Earnings per share - Schedule Of Common Stock Shares Equivalent Excluded From Calculation Of Diluted Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Class B Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method
Antidilutive securities	82,021,389	82,021,389
Stock Option [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method
Antidilutive securities	342	309
Restricted Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method
Antidilutive securities	7,124	783