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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2020
CAPITAL STOCK [Abstract] |
Schedule of Capital Stock | The activity related to outstanding common stock and common stock held in treasury was as follows:
| 2020 |  | 2019 |  | 2018
| Outstanding Common Stock | Treasury Stock |  | Outstanding Common Stock | Treasury Stock |  | Outstanding Common Stock | Treasury Stock
Balance at beginning of period | 53,687,528 |  | 55,971,691 |  |  | 55,862,360 |  | 53,796,859 |  |  | 56,328,863 |  | 53,330,356 |
Exercise of stock options | 311,374 |  | (311,374) |  |  | 232,052 |  | (232,052) |  |  | 930,258 |  | (930,258) |
Settlement of restricted stock units, net of 41,019, 26,107, and 39,075 shares retained, respectively | 82,241 |  | (82,241) |  |  | 52,182 |  | (52,182) |  |  | 80,988 |  | (80,988) |
Settlement of performance share units, net of 16,830, 6,737, and 1,027 shares retained, respectively | 28,098 |  | (28,098) |  |  | 14,027 |  | (14,027) |  |  | 1,911 |  | (1,911) |
Purchase of treasury shares | (1,584,850) |  | 1,584,850 |  |  | (2,473,093) |  | 2,473,093 |  |  | (1,479,660) |  | 1,479,660 |
Balance at end of period | 52,524,391 |  | 57,134,828 |  |  | 53,687,528 |  | 55,971,691 |  |  | 55,862,360 |  | 53,796,859 |

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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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