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SHARE-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table is a summary of our stock option activity (in thousands, except per share data):
| Three months ended March 31,
| 2022 |  | 2021
| Awards |  | Weighted-Average Exercise Price |  | Awards |  | Weighted-Average Exercise Price
Outstanding at beginning of period | 32 |  |  | $ | 54.98 |  |  | 61 |  |  | $ | 48.19 |
Exercised | — |  |  | — |  |  | (11) |  |  | 42.62 |
Outstanding at end of the period | 32 |  |  | $ | 54.98 |  |  | 50 |  |  | $ | 49.43 |
Exercisable at end of the period | 28 |  |  | $ | 52.76 |  |  | 41 |  |  | $ | 44.93 |
Summary of Restricted Stock Activity | The following table summarizes our restricted stock activity (in thousands, except per share data):
| Three months ended March 31,
| 2022 |  | 2021
| Shares |  | Weighted-Average Grant Date Fair Value |  | Shares |  | Weighted-Average Grant Date Fair Value
Outstanding at beginning of period | 43 |  |  | $ | 183.51 |  |  | 50 |  |  | $ | 116.06 |
Granted | 29 |  |  | 175.66 |  |  | 17 |  |  | 253.03 |
Vested | (18) |  |  | 149.95 |  |  | (14) |  |  | 109.14 |
Outstanding at end of the period | 54 |  |  | $ | 190.20 |  |  | 53 |  |  | $ | 157.80 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | The total expenses during the three months ended March 31, 2022 and 2021 are as follows (in thousands):
| Three months ended March 31,
| 2022 |  | 2021
| Shares |  | Share-Based Compensation Expense |  | Shares |  | Share-Based Compensation Expense
Options and restricted stock | 86 |  |  | $ | 1,087 |  |  | 103 |  |  | $ | 938 |
Performance-based share awards granted in 2022 | 25 |  |  | 79 |  |  | — |  |  | — |
Performance-based share awards granted in 2021 | 15 |  |  | 640 |  |  | 14 |  |  | 54 |
Performance-based share awards granted in 2020 | 26 |  |  | 469 |  |  | 28 |  |  | 495 |
Performance-based share awards granted in 2019 | — |  |  | — |  |  | 17 |  |  | 711 |
Total share-based compensation | 152 |  |  | $ | 2,275 |  |  | 162 |  |  | $ | 2,198 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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