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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Balance at Dec. 31, 2018 $ 596,338 $ 1,151 $ 560,221 $ 34,966
Balance, shares at Dec. 31, 2018   115,078    
Vesting of restricted stock units   $ 7 (7)  
Vesting of restricted stock units, shares   735    
Shares withheld for restricted stock units vested (2,450) $ (2) (2,448)  
Shares withheld for restricted stock units vested, shares   (196)    
Repurchase of common stock [1] $ (7,942) $ (4)   (7,938)
Repurchase of common stock, shares (500) (460) [1]    
Exercise of stock options $ 4,959 $ 9 4,950  
Exercise of stock options, shares   895    
Stock compensation expense 12,239   12,239  
Net income 221,809     221,809
Balance at Dec. 31, 2019 824,953 $ 1,161 574,955 248,837
Balance, shares at Dec. 31, 2019   116,052    
Vesting of restricted stock units   $ 7 (7)  
Vesting of restricted stock units, shares   732    
Shares withheld for restricted stock units vested (4,153) $ (2) (4,151)  
Shares withheld for restricted stock units vested, shares   (190)    
Exercise of stock options 1,424 $ 2 1,422  
Exercise of stock options, shares   235    
Stock compensation expense 17,022   17,022  
Net income 313,537     313,537
Balance at Dec. 31, 2020 $ 1,152,783 $ 1,168 589,241 562,374
Balance, shares at Dec. 31, 2020 116,829 116,829    
Merger consideration $ 3,658,362 $ 896 3,657,466  
Merger consideration, shares   89,586    
Vesting of restricted stock units   $ 11 (11)  
Vesting of restricted stock units, shares   1,168    
Shares withheld for restricted stock units vested (18,255) $ (4) (18,251)  
Shares withheld for restricted stock units vested, shares   (394)    
Repurchase of common stock [2] $ (1,748,051) $ (274)   (1,747,777)
Repurchase of common stock, shares (27,500) (27,459) [2]    
Exercise of stock options $ 740 $ 1 739  
Exercise of stock options, shares 90 90    
Stock compensation expense $ 31,486   31,486  
Net income 1,725,416     1,725,416
Balance at Dec. 31, 2021 $ 4,802,481 $ 1,798 $ 4,260,670 $ 540,013
Balance, shares at Dec. 31, 2021 179,820 179,820    
[1] During the year ended December 31, 2019, we repurchased and retired 0.5 million shares of our common stock, at an average price of $17.24 per share, for $7.9 million pursuant to the repurchase program authorized by our board of directors in February 2019. The primary purpose of the repurchase program was to offset dilution from employee stock awards.
[2] During the year ended December 31, 2021, we repurchased and retired 27.5 million shares of our common stock at an average price of $63.63 per share, for $1,748.1 million, net of fees, pursuant to the repurchase program authorized by our board of directors in August 2021, and further expanded by our board of directors in November 2021. The primary purpose of the repurchase program was to offset dilution from the BMC Merger.