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SHAREHOLDERS’ EQUITY | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
SHAREHOLDERS’ EQUITY | SHAREHOLDERS’ EQUITY The following table details activity in our common stock:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount
Stock option exercises | 1,174 |  |  | $ | 124,363 |  |  | 999 |  |  | $ | 96,908 |  |  | 1,126 |  |  | $ | 74,907 |
Purchases of common stock | (59) |  |  | (15,484) |  |  | (72) |  |  | (14,289) |  |  | (781) |  |  | (150,050) |
Employee stock plan purchases | 40 |  |  | 10,912 |  |  | 53 |  |  | 9,576 |  |  | 45 |  |  | 8,051 |
Restricted stock units vested, net of withheld shares upon award settlement | 76 |  |  | (12,923) |  |  | 53 |  |  | (5,361) |  |  | — |  |  | — |
As of February 19, 2021, we had authorization from our board of directors to repurchase up to 2.5 million additional shares of our common stock.

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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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