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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of 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
Schedule of Stock Repurchase | 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 |

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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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