Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details)

v3.21.1
Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income available for Class A and Class B Common Stock $ 160,604 $ (12,986)
Weighted-average shares outstanding - basic (in shares) 60,000  
Weighted-average shares outstanding - diluted (in shares) 60,211  
Basic earnings per share:    
Class A and Class B Common Stock (in dollars per share) $ 2.68  
Diluted earnings per share:    
Class A and Class B Common Stock (in dollars per share) $ 2.67  
Class A Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Weighted-average shares outstanding - basic (in shares) 19,667  
Add dilutive effects of non-vested shares of restricted stock - Class A (in shares) 211  
Class B Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Weighted-average shares outstanding - basic (in shares) 40,333