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STOCKHOLDERS' EQUITY, Restricted Stock and Restricted Stock Units (Details) (USD $)
6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2011
Market-Based Vesting [Member]
Mar. 31, 2011
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
Y
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
Market-Based Vesting [Member]
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
Performance Based [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        
Non-Vested Restricted Stock and Restricted Stock Units Activity [Roll Forward]          
Non-vested at beginning of period (in shares)     822,033 574,750  
Granted (in shares)     329,500 [1]   143,750
Vested (in shares)     (178,977)    
Forfeited (in shares)     (16,356)    
Non-vested at end of period (in shares)     956,200 [2] 574,750  
Expected to vest (in shares)     780,121    
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)   $ 21.71 $ 11.13    
Weighted-average grant date fair value, vested (in dollars per share)     $ 21.24    
Weighted-average grant date fair value, forfeited (in dollars per share)     $ 13.20    
Weighted-average grant date fair value, non-vested at end of period (in dollars per share)     $ 16.35    
Weighted-average grant date fair value, expected to vest (in dollars per share)     $ 16.38    
Non-vested restricted stock weighted-average remaining contractual term (in years)     3.17    
Expected to vest restricted stock weighted-average remaining contractual term (in years)     2.20    
Non-vested restricted stock aggregate intrinsic value     $ 7,095,000    
Expected to vest restricted stock aggregate intrinsic value     5,788,000    
Fair value of restricted stock and stock units vested during the period   $ 4,600,000 $ 3,800,000    
[1] Restricted stock units granted during the six months ended June 30, 2012 included 143,750 units that had vesting based on performance conditions.
[2] Non-vested restricted stock units at June 30, 2012 included 574,750 units that had vesting based on either performance conditions, or market conditions or a combination of performance or market conditions.