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STOCK REPURCHASE PROGRAM (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2017
Equity, Class of Treasury Stock [Line Items]        
Payments For Repurchase Of Common Stock $ 15,190 $ 10,967 $ 9,858  
Stock Repurchased and Retired During Period, Shares 548,539 410,983 354,741  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 1,016,636      
Stock Repurchase Program Additional Number Of Shares Authorized To Be Repurchased       1,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 7,500,000