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NET EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net Earnings (Numerator) [Abstract]        
Basic EPS - Net earnings $ 9,972 $ 9,572 $ 19,240 $ 18,484
Diluted EPS - Net earnings $ 9,972 $ 9,572 $ 19,240 $ 18,484
Number of Shares (Denominator) [Abstract]        
Basic EPS - Weighted average common shares outstanding (in shares) 28,956,523 28,544,898 28,940,875 28,488,327
Effect of dilutive securities - stock options and restricted stock (in shares) 1,316,409 1,687,594 1,354,177 1,673,735
Diluted EPS - Weighted average common shares outstanding and effect of stock options and restricted stock (in shares) 30,272,932 30,232,492 30,295,052 30,162,062
Per Share Amount [Abstract]        
Basic EPS - Net earnings (in dollars per share) $ 0.34 $ 0.34 $ 0.66 $ 0.65
Diluted EPS - Net earnings (in dollars per share) $ 0.33 $ 0.32 $ 0.64 $ 0.61
Stock Options [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive stock options outstanding, excluded from diluted earnings per share calculation (in shares)     519,455 283,100