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STOCK BASED COMPENSATION (Details 4) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of stock options vested based on grant date fair value $ 706 $ 506 $ 460
Intrinsic value of stock options exercised/forfeited 627 943 406
Cash received from stock option exercises 1,242 4,127 743
Tax benefit realized on stock option exercises/repurchase 242 735 91
Weighted average grant date fair value of options granted (per share) $ 0.00 $ 6.58 $ 6.31
Stock options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash paid to settle equity instruments granted under stock based compensation arrangements $ 134 $ 0 $ 0