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STOCKHOLDERS' EQUITY - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Impact of stock-based compensation cost on net earnings | $ (2,547) | $ (1,756) | $ (4,569) | $ (3,419)
Expiration period of options granted |  |  | 10 years |
Shares available for future awards (in shares) | 687,297 |  | 687,297 |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Restricted stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Restricted stock | Minimum | Non-employee director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Restricted stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Vesting period |  |  | 4 years |
Restricted stock | Maximum | Non-employee director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Vesting period |  |  | 4 years |
Performance shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Vesting period |  |  | 3 years |
Cost of sales |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation cost | $ 444 | 310 | $ 744 | 575
Operating expenses |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation cost | $ 2,849 | $ 2,010 | $ 5,170 | $ 3,926

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