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Common Stock (Tables)
9 Months Ended
Sep. 30, 2021
Common Stock [Abstract]  
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 three and nine months ended September 30, 2021 and 2020.

Three Months Ended September 30, Nine Months Ended September 30,
2021202020212020
Shares$Shares$Shares$Shares$
Share buybacks 4,738,842 $3,584 5,466,295 $3,250 15,442,417 $10,450 11,947,078 $6,452 
Income tax withholding104,949 82 186,548 111 572,869 384 769,853 416 
Exercise cost116,961 180,824 612,474 611,499 
4,960,752 $3,666 5,833,667 $3,361 16,627,760 $10,834 13,328,430 $6,868 
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 19).

Three Months Ended September 30, 2021Nine Months Ended September 30, 2021
Number of shares purchased1,200,547 3,962,155 
Amount of shares purchased$880 $2,642