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 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 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 $ 72,096 $ 8,938 $ 160,604 $ 181,822 $ 122,975 $ (12,986) $ 241,638 $ 291,811
Weighted-average shares outstanding - basic (in shares) 60,986           60,332  
Weighted-average shares outstanding - diluted (in shares) 61,400           60,618  
Basic earnings per share:                
Class A and Class B Common Stock (in dollars per share) $ 1.18           $ 4.01  
Diluted earnings per share:                
Class A and Class B Common Stock (in dollars per share) $ 1.17           $ 3.99  
Class A Common Stock                
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                
Weighted-average shares outstanding - basic (in shares) 20,653           19,999  
Add dilutive effects of non-vested shares of restricted stock - Class A (in shares) 414           286  
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