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Net Earnings Per Share - Narrative (Details)
12 Months Ended
Dec. 31, 2021
class_of_stock
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Anti-dilutive securities      
Number of classes of common stock | class_of_stock 2    
Restricted Stock Units (RSUs)      
Anti-dilutive securities      
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares) 1,083,174 1,032,305 945,565
Class B Non‑Voting Common Stock      
Anti-dilutive securities      
Common stock, outstanding (in shares) 0 0