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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	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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