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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2021
CAPITAL STOCK [Abstract] |
Schedule of Capital Stock | 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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- Definition Tabular disclosure of an entity's capital units or capital shares, including the value of capital units or capital shares, units authorized, units outstanding and other information necessary to a fair presentation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 + Details
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