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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
TREASURY STOCK, AT COST |  |  |
Treasury shares issued under the Long Term Incentive Plan | 18,928 |  | 3,000
Shares issued in contingent payments as part of a business combination, shares | 11,669 |  |
Treasury stock repurchased |  | 19,900 | 26,800
COMMON STOCK |  |  |
Shares issued in contingent payments as part of a business combination, shares | 465,787 | 123,280 | 8,559,472
RETAINED EARNINGS |  |  |
Cash dividend declared per share of common stock | $ 0.22 | $ 0.16 | $ 0.12

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