Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Earnings Per Share - Components of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 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 $ 8,938 $ 160,604 $ 122,975 $ (12,986) $ 169,542 $ 109,989
Weighted-average shares outstanding - basic (in shares) 60,000       60,000  
Weighted-average shares outstanding - diluted (in shares) 60,260       60,234  
Basic earnings per share:            
Class A and Class B Common Stock (in dollars per share) $ 0.15       $ 2.83  
Diluted earnings per share:            
Class A and Class B Common Stock (in dollars per share) $ 0.15       $ 2.81  
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       19,667  
Add dilutive effects of non-vested shares of restricted stock - Class A (in shares) 260       234  
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       40,333