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CAPITAL STOCK (Tables) | 12 Months Ended
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Dec. 31, 2019
CAPITAL STOCK |
Schedule of number of shares of common stock and treasury stock and the share activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Common Shares | ​ | Treasury Shares |
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Balance at the beginning of the year |  | 67,341,316 |  | 66,742,490 |  | 4,424,884 | ​ | 4,881,889 | ​
Employee option exercises |  | 1,079,841 |  | 1,182,547 |  | (367,705) | ​ | (502,005) | ​
Director option exercises |  | 146,083 |  | — |  | — | ​ | — | ​
Restricted stock vestings |  | 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 |  | 68,608,508 | ​ | 67,341,316 | ​ | 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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