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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Common stock, shares issued 27,713,811 27,590,531  
COMMON STOCK      
Common stock, shares issued 123,280 8,559,472  
RETAINED EARNINGS      
Cash dividend declared per share of common stock $ 0.16 $ 0.12 $ 0.12
TREASURY STOCK, AT COST      
Treasury stock reissued to satisfy exercised stock options, shares     5,000
Treasury stock reissued under the Equity Incentive Plan, shares   3,000  
Treasury stock repurchased 19,900 26,800 372,368