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STOCK BASED COMPENSATION (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,925 5,922 2,925 5,922 3,327 4,668 7,044 7,537
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 7.20 $ 5.94 $ 7.20 $ 5.94 $ 6.59 $ 6.14 $ 5.79 $ 5.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 3,175 $ 16,630 $ 3,175 $ 16,630 $ 8,791 $ 19,358 $ 16,371 $ 17,494
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures   3   617        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 7.69   $ 7.20        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Total Intrinsic Value   $ 0   $ 0        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (390) (1,014) (1,553) (1,914)        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 1.94 $ 4.47 $ 7.25 $ 4.17        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 2,497 $ 4,015 $ 8,009 $ 7,070        
Forfeited, Options (13) (111) (190) (318)        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 7.16 $ 9.75 $ 10.78 $ 9.46        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Total Intrinsic Value $ 0 $ 0 $ 0 $ 0        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 2,182 4,676 2,182 4,676        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 6.81 $ 5.29 $ 6.81 $ 5.29        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 3,126 $ 15,958 $ 3,126 $ 15,958        
Stock based compensation expense 2,400 $ 1,700 7,500 $ 5,900        
Unrecognized compensation expense $ 19,300   $ 19,300          
Weighted-average period     1 year 8 months