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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of Treasury Stock Activity | Below is a summary of the Company’s treasury stock activity for the years ended December 31, 2019, 2020 and 2021.
| Number of Treasury Shares |  |  | Cost |
Balance at January 1, 2019 |  | 4,626,191 |  |  | $ | 79,259 |
Restricted stock withholdings (1) |  | 59,060 |  |  |  | 2,308 |
Restricted stock forfeitures (2) |  | 26,608 |  |  |  | — |
Balance at December 31, 2019 |  | 4,711,859 |  |  | $ | 81,567 |
Restricted stock withholdings (1) |  | 264,522 |  |  |  | 5,437 |
Restricted stock forfeitures (2) |  | 74,600 |  |  |  | — |
Balance at December 31, 2020 |  | 5,050,981 |  |  | $ | 87,004 |
Restricted stock withholdings (1) |  | 237,416 |  |  |  | 4,102 |
Restricted stock forfeitures (2) |  | 61,714 |  |  |  | — |
Balance at December 31, 2021 |  | 5,350,111 |  |  | $ | 91,106 |
(1) The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. The Company determined the number of shares to be withheld based upon market values that ranged from $36.81 to $40.32 during the year ended December 31, 2019, $8.03 to $32.12 during the year ended December 31, 2020 and $15.21 to $24.14 during the year ended December 31, 2021. The Company repurchased forfeited restricted shares at a cost of $0.001 per share in accordance with the 2017 Omnibus Plan.
Summary of Restricted Stock Activity | Restricted Stock — Below is a summary of restricted stock activity for the years ended December 31, 2019, 2020 and 2021:
|  | Year Ended |  |  | Year Ended |  |  | Year Ended |
|  | December 31, 2019 |  |  | December 31, 2020 |  |  | December 31, 2021 |
|  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |  |  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |  |  | Shares of Restricted Stock |  |  | Weighted Average Grant Date Fair Value |
Outstanding at January 1 |  |  | 704,353 |  |  | $ | 38.68 |  |  |  | 783,823 |  |  | $ | 37.53 |  |  |  | 1,431,975 |  |  | $ | 21.11 |
Granted |  |  | 315,899 |  |  | $ | 37.34 |  |  |  | 1,555,361 |  |  | $ | 17.68 |  |  |  | 1,241,742 |  |  | $ | 21.91 |
Vested |  |  | (209,821 | ) |  | $ | 41.10 |  |  |  | (832,609 | ) |  | $ | 29.30 |  |  |  | (617,607 | ) |  | $ | 20.92 |
Forfeited |  |  | (26,608 | ) |  | $ | 37.69 |  |  |  | (74,600 | ) |  | $ | 30.72 |  |  |  | (61,714 | ) |  | $ | 18.96 |
Outstanding at December 31 |  |  | 783,823 |  |  | $ | 37.53 |  |  |  | 1,431,975 |  |  | $ | 21.11 |  |  |  | 1,994,396 |  |  | $ | 21.73 |
Summary of Restricted Stock and Restricted Stock Unit Award Activity | Below is a summary of restricted stock award activity recorded for the periods indicated.
|  | Year Ended December 31, |
|  | 2019 |  |  | 2020 |  |  | 2021 |
Compensation expense recognized during the period (1) |  | $ | 10,185 |  |  | $ | 15,473 |  |  | $ | 22,846 |
Fair value of restricted shares that vested during the period |  | $ | 8,024 |  |  | $ | 16,870 |  |  | $ | 10,998 |
Income tax benefit related to restricted stock awards |  | $ | 1,516 |  |  | $ | 5,620 |  |  | $ | 1,048 |
(1) The former CEO of the Company retired on December 31, 2021, and all of his outstanding unvested shares vested upon his retirement in accordance with his employment agreement. The Company recorded incremental compensation expense of $4,277 related to the accelerated vesting of these awards during the year ended December 31, 2021.
Restricted Stock Units (RSUs) |
Summary of Restricted Stock and Restricted Stock Unit Award Activity | Below is a summary of activity for restricted stock unit awards for the periods indicated:
|  | Year Ended December 31, |
|  | 2019 |  |  | 2020 |  |  | 2021 |
Number of restricted stock unit awards that vested during the period |  |  | 90,895 |  |  |  | 208,204 |  |  |  | 232,200 |
Fair value of restricted stock unit awards that vested during the period |  | $ | 3,658 |  |  | $ | 5,050 |  |  | $ | 4,095 |
Accumulated dividends paid upon vesting of restricted stock unit awards (1) |  | $ | 386 |  |  | $ | 942 |  |  | $ | 62 |
Compensation expense recognized during the period (2) |  | $ | 4,430 |  |  | $ | 3,931 |  |  | $ | 6,425 |
Income tax benefit related to stock unit awards |  | $ | 397 |  |  | $ | 788 |  |  | $ | 691 |
(1) Approximately $296 of dividends were payable to the former CEO on December 31, 2021 and were paid in January 2022. These dividends were included in other current liabilities on the consolidated balance sheet as of December 31, 2021. (2) The former CEO of the Company retired on December 31, 2021, and all of his outstanding unvested restricted stock units vested upon his retirement in accordance with his employment agreement. The Company recorded incremental compensation expense of $2,374 related to the accelerated vesting of these awards during the year ended December 31, 2021.

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