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Share Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Restricted Stock Unit, Activity | A summary of changes in the common shares subject to nonvested PBRSUs and TBRSUs for the years ended December 31, 2022 and 2021 follows:
| Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2021 | 204,108 |
Granted | 61,890 |
Vested | (48,106) |
Forfeited | (3,522) |
Adjustment for performance conditions of PBRSUs (1) | (2,551) |
Nonvested at January 1, 2022 | 211,819 |
Granted | 52,335 |
Vested | (55,464) |
Forfeited | (8,406) |
Adjustment for performance conditions of PBRSUs (1) | (634) |
Nonvested at December 31, 2022 (2) | 199,650 |
(1) The number of PBRSUs earned depends on the level of achievement with respect to certain performance criteria. Adjustment herein represents the difference between the maximum number of common shares which could be earned and the actual number earned for those PBRSUs as to which the performance period was completed. (2) Nonvested amount herein represents the maximum number of nonvested PBRSUs and TBRSUs. As of December 31, 2022, an aggregate of 198,737 PBRSUs and TBRSUs are expected to vest. A summary of awards that vested during the twelve months ended December 31, 2022 and 2021 follows:
|  | Twelve Months Ended December 31,
|  | 2022 |  | 2021
PBRSU and TBRSU vested |  | 55,464 |  | 48,106
Common shares withheld to satisfy employee income tax withholding obligations |  | 21,219 |  | 18,436
Net common shares issued |  | 34,245 |  |  | 29,670 |
Share-based Payment Arrangement, Nonvested Award, Cost | The following table details expected additional share-based compensation expense related to PBRSUs and TBRSUs currently outstanding:
(In thousands) |  |
2023 |  | $ | 4,375 |
2024 |  | 2,869 |
2025 |  | 1,200 |
2026 |  | 193 |
Total |  | $ | 8,637 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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