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STOCK BASED COMPENSATION (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 2,541,000 $ 1,757,000 $ 4,244,000 $ 3,181,000  
Additional General Disclosures [Abstract]          
Number of directors 7   7    
Stock Options and Employee Stock Purchase Plan (ESPP) [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense 2,191,000 1,753,000 3,830,000 3,172,000  
Stock Options [Member]
         
Assumptions used [Abstract]          
Expected volatility (in hundredths) 58.00% 84.00% 59.00% 85.00%  
Expected life (in years) 4 years 4 years 4 years 4 years  
Risk-free interest rate (in hundredths) 0.73% 0.77% 0.74% 0.81%  
Dividend yield (in hundredths) 0.00% 0.00% 0.00% 0.00%  
Fair value per stock option (in dollars per share) $ 6.81 $ 7.80 $ 6.77 $ 7.84  
Forfeiture rate (in hundredths) 8.00% 8.00% 8.00% 8.00%  
Stock-based compensation activity [Roll Forward]          
Outstanding, beginning balance (in shares)     9,727,000    
Granted (in shares)     276,000    
Exercised (in shares) (93,000) 0 (270,000) (89,000)  
Forfeited (in shares)     (11,000)    
Outstanding, ending balance (in shares) 9,722,000   9,722,000   9,727,000
Exercisable, ending balance (in shares) 7,634,000   7,634,000    
Weighted Average Exercise Price [Roll Forward]          
Outstanding, beginning balance (in dollars per share)     $ 4.22    
Granted (in dollars per share)     $ 15.02    
Exercised (in dollars per share)     $ 2.51    
Forfeited (in dollars per share)     $ 10.81    
Outstanding, ending balance (in dollars per share) $ 4.57   $ 4.57   $ 4.22
Exercisable, end of period (in dollars per share) $ 2.85   $ 2.85    
Outstanding Options, Weighted Average Remaining Contractual Term     2 years 1 month 24 days   2 years 6 months 18 days
Exercisable Options, Weighted Average Remaining Contractual Term     1 year 8 months 19 days    
Additional General Disclosures [Abstract]          
Outstanding options, aggregate intrinsic value, beginning balance     88,918,000    
Outstanding options, aggregate intrinsic value, ending balance 87,484,000   87,484,000   88,918,000
Exercisable options, aggregate intrinsic value, ending balance 81,491,000   81,491,000    
Proceeds from stock options exercised 390,000 0 677,000 155,000  
Tax deductible expenses 950,000 361,000 3,132,000 643,000  
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 350,000 $ 4,000 $ 414,000 $ 8,000  
Additional General Disclosures [Abstract]          
Granted (in shares)     31,899    
Non-vested restricted stock activity, Number of Shares [Roll Forward]          
Non-vested beginning of period (in shares)     17,500    
Granted (in shares)     31,899    
Forfeited (in shares)     0    
Vested (in shares)     (15,946)    
Non-vested end of period (in shares) 33,453   33,453    
Non-vested restricted stock activity, Weighted Average Grant Date Fair Value [Roll Forward]          
Non-vested beginning of period (in dollars per share)     $ 14.63    
Granted (in dollars per share)     $ 15.36    
Forfeited (in dollars per share)     $ 0    
Vested (in dollars per share)     $ 15.36    
Non-vested end of period (in dollars per share) $ 14.98   $ 14.98    
Restricted Stock [Member] | Director [Member]
         
Additional General Disclosures [Abstract]          
Granted (in shares)     4,557    
Common stock vested immediately upon issuance (in shares)     2,278    
Remaining shares per director vest in one year (in shares) 2,279   2,279    
Non-vested restricted stock activity, Number of Shares [Roll Forward]          
Granted (in shares)     4,557