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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2020
CAPITAL STOCK |
Schedule of number of shares of common stock and treasury stock and the share activity | The number of shares of common stock and treasury stock and the share activity were as follows:
| Common Shares |  | Treasury Shares
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Balance at the beginning of the year | 68,608,508 |  |  | 67,341,316 |  |  | 66,742,490 |  |  | 4,836,027 |  |  | 4,424,884 |  |  | 4,881,889 |
Employee option exercises | 802,046 |  |  | 1,079,841 |  |  | 1,182,547 |  |  | (307,976) |  |  | (367,705) |  |  | (502,005) |
Director option exercises | 26,551 |  |  | 146,083 |  |  | — |  |  | — |  |  | — |  |  | — |
Restricted stock vestings | 79,700 |  |  | 41,268 |  |  | 39,691 |  |  | — |  |  | — |  |  | — |
Common stock repurchases | — |  |  | — |  |  | — |  |  | — |  |  | 778,848 |  |  | 45,000 |
Common stock repurchased and retired | — |  |  | — |  |  | (623,412) |  |  | — |  |  | — |  |  | — |
Balance at the end of the year | 69,516,805 |  |  | 68,608,508 |  |  | 67,341,316 |  |  | 4,528,051 |  |  | 4,836,027 |  |  | 4,424,884 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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