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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
Total
Common Stock [Member]
Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance, shares at Dec. 31, 2020   17,092,432      
Restricted stock awards, net of forfeitures, shares   (109,028)      
Common stock repurchased, shares (991,571) (991,571)      
Restricted stock units converted to common stock, shares   11,416      
Balance, shares at Jun. 30, 2021   16,003,249      
Balance at Dec. 31, 2020 $ 2,302,500,000 $ 200,000 $ 161,900,000 $ 2,138,800,000 $ 1,600,000
Net income 490,700,000 0 0 490,700,000 0
Other comprehensive loss (700,000) 0 0 0 (700,000)
Stock-based compensation (9,800,000) 0 (9,800,000) 0 0
Common stock repurchased, value (389,700,000) 0 (1,300,000) (388,400,000) 0
Balance at Jun. 30, 2021 2,393,000,000 $ 200,000 150,800,000 2,241,100,000 900,000
Balance, shares at Mar. 31, 2021   16,710,422      
Restricted stock awards, net of forfeitures, shares   (109,010)      
Common stock repurchased, shares   (598,163)      
Balance, shares at Jun. 30, 2021   16,003,249      
Balance at Mar. 31, 2021 2,369,800,000 $ 200,000 161,700,000 2,207,000,000 900,000
Net income 288,600,000 0 0 288,600,000 0
Stock-based compensation (10,900,000) 0 (10,900,000) 0 0
Common stock repurchased, value (254,500,000) 0 0 (254,500,000) 0
Balance at Jun. 30, 2021 $ 2,393,000,000 $ 200,000 150,800,000 2,241,100,000 900,000
Balance, shares at Dec. 31, 2021 14,145,888 14,145,888      
Common stock repurchased, shares (1,207,688) (1,207,688)      
Restricted stock units converted to common stock, shares   3,980      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   33,275      
Balance, shares at Jun. 30, 2022 12,975,455 12,975,455      
Balance at Dec. 31, 2021 $ 1,824,200,000 $ 100,000 197,200,000 1,626,700,000 200,000
Net income 321,700,000 0 0 321,700,000 0
Other comprehensive loss (2,400,000) 0 0 0 (2,400,000)
Stock-based compensation 18,200,000 0 18,200,000 0 0
Common stock repurchased, value (652,700,000) 0 (700,000) (652,000,000.0) 0
Stock Issued During Period, Value, Stock Options Exercised 11,100,000   11,100,000    
Balance at Jun. 30, 2022 $ 1,520,100,000 $ 100,000 225,800,000 1,296,400,000 (2,200,000)
Balance, shares at Mar. 31, 2022   13,363,783      
Common stock repurchased, shares   (403,953)      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   15,625      
Balance, shares at Jun. 30, 2022 12,975,455 12,975,455      
Balance at Mar. 31, 2022 $ 1,628,800,000 $ 100,000 211,500,000 1,418,700,000 (1,500,000)
Net income 107,400,000 0 0 107,400,000 0
Other comprehensive loss (700,000) 0 0 0 (700,000)
Stock-based compensation 9,100,000 0 9,100,000 0 0
Common stock repurchased, value (229,700,000) 0 0 (229,700,000) 0
Stock Issued During Period, Value, Stock Options Exercised 5,200,000   5,200,000    
Balance at Jun. 30, 2022 $ 1,520,100,000 $ 100,000 $ 225,800,000 $ 1,296,400,000 $ (2,200,000)