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SHAREHOLDERS' EQUITY (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jul. 24, 2020 | Feb. 28, 2019 | Feb. 28, 2018 | May 31, 2017
Calculation of weighted average common shares |  |  |  |  |  |  |  |  |
Weighted average common shares, basic | 13,268 | 13,033 | 13,194 | 12,992 |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Effect of stock options (in shares) | 0 | 0 | 452 | 0 |  |  |  |  |
Effect of dilutive share awards (in shares) | 0 | 0 | 96 | 0 |  |  |  |  |
Effect of Convertible Senior Notes (in shares) | 0 | 0 | 55 | 0 |  |  |  |  |
Weighted average common shares, diluted | 13,268 | 13,033 | 13,797 | 12,992 |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 400 | 1,300 |  | 1,100 |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  |
Value of common stock authorized to be repurchased |  |  |  |  |  |  | $ 150.0 | $ 100.0 |
Remaining authorized repurchase amount | $ 179.7 |  | $ 179.7 |  |  |  |  |  |
2025 Convertible Notes |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Stated interest rate | 0.50% |  | 0.50% |  | 0.50% |  |  |  |
2025 Convertible Notes | Convertible Debt |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 0.50% | 0.50% |  |  |
2022 Convertible Notes |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Stated interest rate | 0.625% |  | 0.625% |  | 0.625% |  |  |  |
2022 Convertible Notes | Convertible Debt |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 0.625% |  |  |  | 0.625%
Option |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 900 | 100 | 400 | 200 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 200 |  | 100 |  |  |  |  |  |

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