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STOCKHOLDERS' EQUITY | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019, and 2018:
| Year Ended December 31,
| 2020 | 2019 | 2018
Shares issued and outstanding, beginning balance | 69,065,491 |  | 70,596,559 |  | 69,818,392 |
Issuance of common stock from vested restricted stock units (1) | 659,689 |  | 1,036,119 |  | 1,634,271 |
Issuance of common stock from exercise of stock options | 81,026 |  | 187,504 |  | 617,157 |
Issuance of common stock for employee stock purchase plan | 236,887 |  | 207,324 |  | 175,966 |
Repurchase of common stock | (3,307,074) |  | (2,510,376) |  | (1,190,995) |
Awards effectively repurchased for required employee withholding taxes | (279,356) |  | (451,639) |  | (458,232) |
Shares issued and outstanding, ending balance | 66,456,663 |  | 69,065,491 |  | 70,596,559 |
(1) Net of shares of common stock underlying cancelled RSAs Stock Repurchases In February 2020, our board of directors authorized a $300 million incremental increase to our ongoing 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, 2020, 2019 and 2018:
| Year Ended December 31,
| 2020 | 2019 | 2018
Total cost (in millions) | $ | 178 |  | $ | 140 |  | $ | 61 |
Total shares | 3,307,074 |  | 2,510,376 |  | 1,190,995 |
Average price per share | $ | 53.85 |  | $ | 55.64 |  | $ | 51.22 |
As of December 31, 2020, $358 million remains available for repurchase under all authorizations approved by the board of directors.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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