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NET INCOME PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income $ 20,422 $ 15,382 $ 24,443 $ 10,624
Weighted average common shares outstanding – Basic 46,266,142 45,859,286 46,222,146 45,841,446
Common stock equivalents arising from stock options and ESPP 249,618 498,802 262,434 503,908
Restricted stock awards and units and performance units 98,966 138,032 148,402 178,186
Weighted average common shares outstanding – Diluted 46,614,726 46,496,120 46,632,982 46,523,540
Basic (in dollars per share) $ 0.44 $ 0.34 $ 0.53 $ 0.23
Diluted (in dollars per share) $ 0.44 $ 0.33 $ 0.52 $ 0.23
Antidilutive securities excluded from the calculation of earnings per share 232,245 242,891 286,225 227,088