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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2021
Common Stock [Abstract]  
Schedule of Changes in Common Stock Outstanding
The following table summarizes our shares outstanding for the three years ended December 31, 2021:

Class A Common StockClass B Common Stock
BALANCE, December 31, 2018225,353,807 1 
Exercise of stock options1,271,419 — 
Restricted stock issuances, net of cancellations8,284 — 
Restricted stock unit vesting728,553 — 
Purchase of treasury stock (17,386,100)— 
BALANCE, December 31, 2019209,975,963 1 
Issuance of equity55,294 — 
Exercise of stock options3,160,065 — 
Restricted stock issuances, net of cancellations5,992 — 
Restricted stock unit vesting753,139 — 
Purchase of treasury stock (20,219,461)— 
BALANCE, December 31, 2020193,730,992 1 
Exercise of stock options1,568,488 — 
Restricted stock issuances, net of cancellations4,627 — 
Restricted stock unit vesting664,771 — 
Purchase of treasury stock(23,227,642)— 
BALANCE, December 31, 2021172,741,236 1 
Class of Treasury Stock
The following represents the Company's purchase of Charter Class A common stock and the effect on the consolidated statements of cash flows during the years ended December 31, 2021, 2020 and 2019.

Year Ended December 31,
202120202019
Shares$Shares$Shares$
Share buybacks22,015,125 $15,038 18,444,203 $10,639 16,697,458 $6,734 
Income tax withholding586,008 393 1,022,783 578 380,797 139 
Exercise cost626,509 752,475 307,845 
23,227,642 $15,431 20,219,461 $11,217 17,386,100 $6,873 

Share buybacks above include shares of Charter Class A common stock purchased from Liberty Broadband Corporation (“Liberty Broadband”) pursuant to the LBB Letter Agreement as follows (see Note 21).
Year Ended December 31, 2021
Number of shares purchased6,077,664 
Amount of shares purchased$4,179