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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
COMMON STOCK |  |  |
Treasury shares issued under the Long Term Incentive Plan | 80,007 | 247,853 | 18,928
Shares issued in contingent payments as part of a business combination, shares |  |  | 465,787
RETAINED EARNINGS |  |  |
Cash dividend declared per share of common stock | $ 0.38 | $ 0.30 | $ 0.22
TREASURY STOCK, AT COST |  |  |
Shares issued in contingent payments as part of a business combination, shares | 11,669 |  |
Shares issued under long term incentive plan | 125,517 | 324,978 | 18,928
Treasury stock repurchased | 201,169 |  |
Shares retained to cover tax withholdings under the Long Term Incentive Plan | 45,510 | 77,125 |

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