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STOCKHOLDERS' EQUITY, Restricted Stock and Restricted Stock Units (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 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)   4.11%
Expected volatility (in hundredths)   41.40%
Expected life (in years)   3.00
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) 287,500 [1]  
Vested (in shares) (119,773)  
Forfeited (in shares) (3,856)  
Non-vested at end of period (in shares) 985,904 [2]  
Expected to vest (in shares) 786,946  
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) $ 11.70 $ 22.16
Weighted-average grant date fair value, vested (in dollars per share) $ 22.99  
Weighted-average grant date fair value, forfeited (in dollars per share) $ 19.26  
Weighted-average grant date fair value, non-vested at end of period (in dollars per share) $ 16.76  
Weighted-average grant date fair value, expected to vest (in dollars per share) $ 16.90  
Non-vested restricted stock weighted-average remaining contractual term (in years) 2.21  
Expected to vest restricted stock weighted-average remaining contractual term (in years) 2.09  
Non-vested restricted stock aggregate intrinsic value $ 10,835,000  
Expected to vest restricted stock aggregate intrinsic value 8,649,000  
Fair value of restricted stock and stock units vested during the period $ 1,300,000 $ 3,300,000
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) 582,250  
Restricted Stock Units (RSUs) [Member] | Performance Based [Member]
   
Non-Vested Restricted Stock and Restricted Stock Units Activity [Roll Forward]    
Granted (in shares) 143,750  
[1] Restricted stock units granted during the three months ended March 31, 2012 included 143,750 units that had vesting based on performance conditions.
[2] Non-vested restricted stock units at March 31, 2012 included 582,250 units that had vesting based on either performance conditions, or market conditions or a combination of performance or market conditions.