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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
COMMON STOCK      
Treasury shares issued under the Long Term Incentive Plan 247,853 18,928  
Shares issued in contingent payments as part of a business combination, shares   465,787 123,280
RETAINED EARNINGS      
Cash dividend declared per share of common stock $ 0.30 $ 0.22 $ 0.16
TREASURY STOCK, AT COST      
Treasury shares issued under the Long Term Incentive Plan 324,978 18,928  
Shares issued in contingent payments as part of a business combination, shares 11,669    
Treasury stock repurchased     19,900
Shares retained to cover tax withholdings under the Long Term Incentive Plan 77,125