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CAPITAL STOCK | 12 Months Ended
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Dec. 31, 2021
CAPITAL STOCK [Abstract] |
CAPITAL STOCK | CAPITAL STOCK The Company had no shares of preferred stock outstanding as of December 31, 2021 and 2020. The activity related to outstanding common stock and common stock held in treasury was as follows:
| 2021 |  | 2020 |  | 2019
| Outstanding Common Stock | Treasury Stock |  | Outstanding Common Stock | Treasury Stock |  | Outstanding Common Stock | Treasury Stock
Balance at beginning of period | 52,524,391 |  | 57,134,828 |  |  | 53,687,528 |  | 55,971,691 |  |  | 55,862,360 |  | 53,796,859 |
Exercise of stock options | 188,444 |  | (188,444) |  |  | 311,374 |  | (311,374) |  |  | 232,052 |  | (232,052) |
Settlement of restricted stock units – net of 61,377, 41,019, and 26,107 shares retained, respectively | 127,969 |  | (127,969) |  |  | 82,241 |  | (82,241) |  |  | 52,182 |  | (52,182) |
Settlement of performance share units – net of 9,746, 16,830, and 6,737 shares retained, respectively | 12,507 |  | (12,507) |  |  | 28,098 |  | (28,098) |  |  | 14,027 |  | (14,027) |
Purchase of treasury shares | (1,633,106) |  | 1,633,106 |  |  | (1,584,850) |  | 1,584,850 |  |  | (2,473,093) |  | 2,473,093 |
Balance at end of period | 51,220,205 |  | 58,439,014 |  |  | 52,524,391 |  | 57,134,828 |  |  | 53,687,528 |  | 55,971,691 |

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