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Stockholders' Equity
 6 Months Ended
Jun. 30, 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 three and six months ended June 30, 2021 and 2020:
Three Months Ended
June 30,		Six Months Ended
June 30,
2021202020212020
Shares issued and outstanding, beginning balance65,881,233 68,470,050 66,456,663 69,065,491 
Issuance of common stock from vested restricted stock units
130,560 168,621 346,518 342,250 
Issuance of common stock from exercise of stock options
8,894 11,136 29,735 40,609 
Issuance of common stock for employee stock purchase plan
74,070 130,532 74,070 130,532 
Repurchase of common stock
(181,250)(1,419,984)(925,251)(2,167,401)
Awards effectively repurchased for required employee withholding taxes
(49,391)(67,491)(117,619)(118,617)
Shares issued and outstanding, ending balance
65,864,116 67,292,864 65,864,116 67,292,864 
Stock Repurchases
During the six months ended June 30, 2021, we repurchased 925,251 shares of common stock for approximately $74 million. We retire shares in the period they are acquired and account for the payment as a reduction to stockholders' equity. As of June 30, 2021, approximately $284 million remained available for further repurchases of our common stock under all authorizations from our board of directors under this program. This repurchase authorization has no expiration.