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STOCKHOLDERS' EQUITY (Details) (USD $)
6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Plan
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
$ 4.00-$13.99 [Member]
Jun. 30, 2013
$ 14.00-$19.99 [Member]
Jun. 30, 2013
$ 20.00-$25.00 [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Jun. 30, 2013
LTIP [Member]
Jun. 30, 2012
LTIP [Member]
Jun. 30, 2013
LTIP [Member]
Stock Options [Member]
Jun. 30, 2012
LTIP [Member]
Stock Options [Member]
Jun. 30, 2013
LTIP [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Number of stock incentive plans 2                              
Vesting period of performance-based shares 4 years   4 years                          
Net share settlement for restricted stock (in shares)                           60,552 24,488  
Net share settlement for stock options (in shares)                       60,552 24,488      
Decrease in equity due to payment of tax for employee                       $ 400,000 $ 200,000      
Shares [Abstract]                                
Nonvested restricted stock outstanding, beginning balance (in shares)                 1,341,084              
Granted                 434,308              
Canceled (in shares)                 (33,529)              
Vested (in shares)                 (222,377)              
Nonvested restricted stock outstanding, ending balance (in shares)             1,519,486   1,519,486              
Weighted Average Grant Date Fair Value [Abstract]                                
Nonvested restricted stock outstanding, beginning balance (in dollars per share)                 $ 7.79              
Granted                 $ 5.62              
Canceled (in dollars per share)                 $ 16.70              
Vested (in dollars per share)                 $ 9.32              
Nonvested restricted stock outstanding, ending balance (in dollars per share)             $ 6.71   $ 6.71              
Recognized restricted stock expense             1,000,000 1,000,000 2,300,000 1,800,000            
Unrecognized restricted stock expense             8,200,000   8,200,000   8,600,000          
Outstanding restricted shares, intrinsic value                               8,000,000
Shares [Abstract]                                
Outstanding, beginning balance (in shares) 655,875                              
Canceled (in shares) (18,000)                              
Outstanding, ending balance (in shares) 637,875 655,875                            
Vested or expected to vest (in shares) 616,210                              
Exercisable, ending balance (in shares) 529,552                              
Weighted Average Exercise Price Per Share [Abstract]                                
Outstanding, beginning balance (in dollars per share) $ 14.72                              
Canceled (in dollars per share) $ 18.21                              
Outstanding, ending balance (in dollars per share) $ 14.62 $ 14.72                            
Vested or expected to vest (in dollars per share) $ 14.82                              
Exercisable, ending balance (in dollars per share) $ 15.77                              
Weighted Average Remaining Contractual Term [Abstract]                                
Outstanding, beginning balance 4 years 8 months 1 day 4 years 10 months 20 days                            
Outstanding, ending balance 4 years 8 months 1 day 4 years 10 months 20 days                            
Vested or expected to vest 4 years 6 months 7 days                              
Exercisable, ending balance 3 years 9 months 25 days                              
Aggregate Intrinsic Value [Abstract]                                
Outstanding, beginning balance 0                              
Canceled 0                              
Outstanding, ending balance 0 0                            
Vested or expected to vest 0                              
Exercisable, ending balance 0                              
Unrecognized pre-tax compensation expense $ 200,000                              
Weighted average period of unrecognized pre-tax compensation 2 years 8 months 12 days                              
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                                
Range of Exercise Prices, Minimum (in dollars per share)       $ 4.00 $ 14.00 $ 20.00                    
Range of Exercise Prices, Maximum (in dollars per share)       $ 13.99 $ 19.99 $ 25.00                    
Shares (in shares) 637,875     262,792 270,083 105,000                    
Contractual Weighted Average Life 4 years 8 months 1 day     6 years 10 months 13 days 2 years 11 months 19 days 3 years 6 months 7 days                    
Weighted Average Price (in dollars per share) $ 14.62     $ 9.63 $ 16.48 $ 22.33                    
Shares (in shares) 529,552     164,801 270,083 94,668                    
Weighted Exercise Price (in dollars per share) $ 15.77     $ 10.72 $ 16.48 $ 22.52