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CAPITAL STOCK (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common stock and treasury stock and the share activity |  |  |
Authorized common stock (in shares) | 199,000,000 | 199,000,000 |
Balance at the beginning of the year (in shares) | 68,600,000 |  |
Balance at the end of the year (in shares) | 69,500,000 | 68,600,000 |
Cash dividends paid on the common stock | $ 92,658 | $ 90,208 | $ 82,346
Common Stock Par Value |  |  |
Common stock and treasury stock and the share activity |  |  |
Balance at the beginning of the year (in shares) | 68,608,508 | 67,341,316 | 66,742,490
Restricted stock vestings (in shares) | 79,700 | 41,268 | 39,691
Common stock repurchased and retired (in shares) | 0 | 0 | (623,412)
Balance at the end of the year (in shares) | 69,516,805 | 68,608,508 | 67,341,316
Common Stock Par Value | Stock Awards Plans |  |  |
Common stock and treasury stock and the share activity |  |  |
Stock option exercises (in shares) | 802,046 | 1,079,841 | 1,182,547
Common Stock Par Value | Director Stock Option Plans |  |  |
Common stock and treasury stock and the share activity |  |  |
Stock option exercises (in shares) | 26,551 | 146,083 | 0
Treasury Stock |  |  |
Common stock and treasury stock and the share activity |  |  |
Balance at the beginning of the year (in shares) | 4,836,027 | 4,424,884 | 4,881,889
Common stock repurchased (in shares) | 0 | 778,848 | 45,000
Balance at the end of the year (in shares) | 4,528,051 | 4,836,027 | 4,424,884
Treasury Stock | Stock Awards Plans |  |  |
Common stock and treasury stock and the share activity |  |  |
Stock option exercises (in shares) | 307,976 | 367,705 | 502,005

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