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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Share-Based Compensation Expense | The Company recorded compensation expense related to the awards granted under the LTIP as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Restricted stock units | $ | 1,561 |  |  | $ | 1,350 |  |  | $ | 4,628 |  |  | $ | 3,935 |
Performance stock units | 728 |  |  | 373 |  |  | 1,468 |  |  | 375 |
Stock options | — |  |  | — |  |  | — |  |  | 126 |
Total stock-based compensation | $ | 2,289 |  |  | $ | 1,723 |  |  | $ | 6,096 |  |  | $ | 4,436 |
Summary of Unrecognized Compensation Expense and Vesting Criterion | As of September 30, 2021, unrecognized compensation expense will be amortized through the relevant periods as follows (in thousands):
| Unrecognized Compensation Expense |  | Final Year of Recognition
Restricted stock units | $ | 8,886 |  |  | 2024
Performance stock units | 4,911 |  |  | 2023
| $ | 13,797 |  |  |
The total number of PSUs granted was split as follows for the relevant grant years:
| 2021 |  | 2020 |  | 2019
TSR | 100 | % |  | 67 | % |  | 50 | %
ROCE | — | % |  | 33 | % |  | 50 | %
Summary of the Status and Activity of Non-vested Restricted Stock | A summary of the status and activity of non-vested restricted stock units for the nine months ended September 30, 2021 is presented below:
| Restricted Stock Units |  | Weighted-Average Grant-Date Fair Value
Non-vested, beginning of year | 550,056 |  |  | $ | 20.30 |
Granted | 178,567 |  |  | 34.35 |
Vested | (267,635) |  |  | 21.12 |
Forfeited | (23,586) |  |  | 17.25 |
Non-vested, end of quarter | 437,402 |  |  | $ | 25.69 |
Summary of the Status and Activity of Non-Vested Performance Stock | A summary of the status and activity of performance stock units for the nine months ended September 30, 2021 is presented below:
| Performance Stock Units(1) |  | Weighted-Average Grant-Date Fair Value
Non-vested, beginning of year | 185,588 |  |  | $ | 22.63 |
Granted | 64,258 |  |  | 68.99 |
Vested | — |  |  | — |
Forfeited | — |  |  | — |
Non-vested, end of quarter | 249,846 |  |  | $ | 34.56 |
___________________________ (1)The number of awards assumes that the associated performance condition is met at the target amount. The final number of shares of the Company's common stock issued may vary depending on the performance multiplier, which ranges from zero to two, depending on the level of satisfaction of the performance condition.
Summary of the Status and Activity of Non-Vested Units | A summary of the status and activity of stock options for the nine months ended September 30, 2021 is presented below:
| Stock Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding, beginning of year | 72,368 |  |  | $ | 34.36 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (21,878) |  |  | 34.36 |  |  |  |  |
Forfeited | (510) |  |  | 34.36 |  |  |  |  |
Outstanding, end of quarter | 49,980 |  |  | $ | 34.36 |  |  | 5.6 |  | $ | 677 |
Number of options outstanding and exercisable | 49,980 |  |  | $ | 34.36 |  |  | 5.6 |  | $ | 677 |

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