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STOCKHOLDERS' EQUITY, Restricted Stock and Restricted Stock Units (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Y
Sep. 30, 2011
Market-Based Vesting [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield (in hundredths)   0.00%
Risk-free interest rate (in hundredths)   3.90%
Expected volatility (in hundredths)   41.50%
Expected life (in years)   3.04
Restricted Stock Units (RSUs) [Member]
   
Non-Vested Restricted Stock and Restricted Stock Units Activity [Roll Forward]    
Non-vested at beginning of period (in shares) 822,033  
Granted (in shares) 352,500 [1]  
Vested (in shares) (232,572)  
Forfeited (in shares) (241,339)  
Non-vested at end of period (in shares) 700,622 [2]  
Expected to vest (in shares) 607,928  
Weighted-average grant date fair value, non-vested at beginning of period (in dollars per share) $ 19.45  
Weighted-average grant date fair value, granted (in dollars per share) $ 11.00 $ 25.16
Weighted-average grant date fair value, vested (in dollars per share) $ 19.70  
Weighted-average grant date fair value, forfeited (in dollars per share) $ 16.56  
Weighted-average grant date fair value, non-vested at end of period (in dollars per share) $ 15.86  
Weighted-average grant date fair value, expected to vest (in dollars per share) $ 15.69  
Non-vested restricted stock weighted-average remaining contractual term (in years) 3.21  
Expected to vest restricted stock weighted-average remaining contractual term (in years) 2.05  
Non-vested restricted stock aggregate intrinsic value $ 6,621,000  
Expected to vest restricted stock aggregate intrinsic value 5,745,000  
Fair value of restricted stock and stock units vested during the period $ 4,600,000 $ 5,100,000
Restricted Stock Units (RSUs) [Member] | Market-Based Vesting [Member]
   
Non-Vested Restricted Stock and Restricted Stock Units Activity [Roll Forward]    
Non-vested at end of period (in shares) 416,500  
Restricted Stock Units (RSUs) [Member] | Performance Based [Member]
   
Non-Vested Restricted Stock and Restricted Stock Units Activity [Roll Forward]    
Granted (in shares) 155,250  
[1] Restricted stock units granted during the nine months ended September 30, 2012 included 155,250 units that had vesting based on performance conditions.
[2] Non-vested restricted stock units at September 30, 2012 included 416,500 units that had vesting based on either performance conditions, or market conditions or a combination of performance and market conditions.