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SHAREHOLDERS' EQUITY (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 24, 2020 | Feb. 20, 2019 | Feb. 21, 2018
Weighted average shares outstanding: |  |  |  |  |  |
Weighted average basic common shares (in shares) | 13,007,000 | 12,834,000 | 12,504,000 |  |  |
Effect of stock options (in shares) | 0 | 747,000 | 1,043,000 |  |  |
Effect of dilutive share awards (in shares) | 0 | 167,000 | 153,000 |  |  |
Effect of Convertible Senior Notes and warrants (in shares) | 0 | 871,000 | 397,000 |  |  |
Weighted average diluted common shares (in shares) | 13,007,000 | 14,619,000 | 14,097,000 |  |  |
Additional disclosure |  |  |  |  |  |
Anti-dilutive securities excluded from calculation of diluted earnings per share | 1,100,000 |  |  |  |  |
Common Stock Repurchases |  |  |  |  |  |
Value of common stock authorized to be repurchased |  |  |  |  | $ 150,000,000.0 | $ 100,000,000.0
Purchase of treasury stock (in shares) |  | 22,731 | 379,449 |  |  |
Value of treasury stock acquired |  | $ 5,470,000 | $ 92,606,000 |  |  |
Remaining authorized repurchase amount | $ 179,700,000 |  |  |  |  |
2025 Convertible Notes |  |  |  |  |  |
Additional disclosure |  |  |  |  |  |
Interest rate | 0.50% |  |  | 0.50% |  |
Stock Options |  |  |  |  |  |
Additional disclosure |  |  |  |  |  |
Anti-dilutive securities excluded from calculation of diluted earnings per share | 200,000 | 100,000 | 400,000 |  |  |

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