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STOCKHOLDERS' EQUITY
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY
Common Stock
The following table shows the beginning and ending balances of our issued and outstanding common stock for the year ended December 31, 2021, 2020, and 2019:
Year Ended
December 31,
202120202019
Shares issued and outstanding, beginning balance66,456,663 69,065,491 70,596,559 
Issuance of common stock from vested restricted stock units748,881 659,689 1,036,119 
Issuance of common stock from exercise of stock options
73,118 81,026 187,504 
Issuance of common stock for employee stock purchase plan
136,861 236,887 207,324 
Repurchase of common stock
(1,161,909)(3,307,074)(2,510,376)
Awards effectively repurchased for required employee withholding taxes
(285,390)(279,356)(451,639)
Shares issued and outstanding, ending balance
65,968,224 66,456,663 69,065,491 
Stock Repurchases
In February 2020, our board of directors authorized a $300 million incremental increase to our ongoing stock repurchase program. In February 2022, our board of directors authorized a further $300 million incremental increase to this stock repurchase program. This repurchase authorization has no expiration. We retire shares in the period they are acquired and account for the payment as a reduction to stockholders' equity.
The following table summarizes the share repurchases under this program for the years ended December 31, 2021, 2020 and 2019:
Year Ended
December 31,
202120202019
Total cost (in millions)$94 $178 $140 
Total shares1,161,909 3,307,074 2,510,376 
Average price per share$81.13 $53.85 $55.64 
As of December 31, 2021, $263 million remains available for repurchase under all authorizations approved by the board of directors.