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STOCK BASED AND DEFERRED COMPENSATION (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Stock-based compensation expense | $ | 6,156 |  |  | $ | 6,852 |  |  | $ | 16,557 |  |  | $ | 16,897 |
Non-vested shares granted | 4,151 |  |  | 13,478 |  |  | 184,563 |  |  | 278,340 |
Performance-based non-vested shares granted | — |  |  | 3,322 |  |  | 42,964 |  |  | 43,326 |
Performance-based shares issued in excess of target shares granted (1) | — |  |  | — |  |  | 26,167 |  |  | 37,146 |
Restricted stock awards vested (includes performance-based awards) | 4,355 |  |  | 4,418 |  |  | 291,526 |  |  | 396,578 |
(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
|  | September 30, 2023 |  | December 31, 2022
Unrecognized stock-based compensation cost |  | $ | 32,844 |  |  | $ | 29,187 |
Weighted average years expense recognition period |  | 1.97 |  | 1.98
Total equity awards outstanding (1) |  | 703,415 |  |  | 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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