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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
COMMON STOCK |  |  |
Treasury shares issued under the Long Term Incentive Plan | 64,171 | 80,007 | 247,853
Shares issued as part of a business combination | 1,398,229 |  |
RETAINED EARNINGS |  |  |
Cash dividend declared per share of common stock | $ 0.44 | $ 0.38 | $ 0.30
TREASURY STOCK, AT COST |  |  |
Shares issued under long term incentive plan | 99,318 | 125,517 | 324,978
Treasury stock repurchased | 942,967 | 201,169 |
Shares retained to cover tax withholdings under the Long Term Incentive Plan | 35,147 | 45,510 | 77,125

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