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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of Compensation Expense and Stock Award Activity | Below is a summary of stock-based compensation expense and stock award activity (dollars in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Stock-based compensation expense | $ | 4,176 |  |  | $ | 4,070 |  |  | $ | 10,401 |  |  | $ | 10,045 |
Non-vested shares granted | 2,100 |  |  | — |  |  | 180,412 |  |  | 264,862 |
Performance-based non-vested shares granted | — |  |  | — |  |  | 42,964 |  |  | 40,004 |
Performance-based shares issued in excess of target shares granted (1) | — |  |  | — |  |  | 26,167 |  |  | 37,146 |
Restricted stock awards vested (includes performance-based awards) | — |  |  | — |  |  | 287,171 |  |  | 392,160 |
(1)Performance-based shares that vested and were issued as a result of performance achievement exceeding the originally established targeted number of shares related to respective performance metrics.
Summary of Additional Information Regarding Stock Plan | The following table includes additional information regarding our stock compensation plan (dollars in thousands):
|  | As of
|  | June 30, 2023 |  | December 31, 2022
Unrecognized stock-based compensation cost |  | $ | 36,709 |  |  | $ | 29,187 |
Weighted average years expense recognition period |  | 2.12 |  | 1.98
Total equity awards outstanding (1) |  | 739,109 |  |  | 803,769 |
(1)Includes unvested restricted stock awards, restricted stock units and performance-based awards (assuming 100%/target payout).

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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 -Topic 718 -SubTopic 10 -Subparagraph (i) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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