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Equity-Based Compensation (Details 3) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Option Award Activity Detail [Table]      
Outstanding at December 31, 2010 4,318,000    
Outstanding at December 31, 2010, weighted average option price per share $ 12.82    
Options granted 689,000    
Options granted, weighted average option price per share $ 6.84    
Options cancelled (425,000)    
Options cancelled, weighted average option price per share $ 18.2    
Options exercised (249,000)    
Options exercised, weighted average option price per share $ 4.03    
Outstanding at December 31, 2011 4,333,000 4,318,000  
Outstanding at December 31, 2011, weighted average option price per share $ 11.85 $ 12.82  
Options expected to vest 989,000    
Options expected to vest, weighted average option price per share $ 9.1    
Options exercisable at period end 3,344,000    
Options exercisable at period end, weighted average option price per share $ 12.67    
Shares reserved for future grants 1,846,000    
Total intrinsic value of options exercised $ 600,000 $ 2,500,000 $ 1,800,000
Intrinsic value of options outstanding 7,900,000    
Intrinsic value of options expected to vest 900,000    
Intrinsic value of options exercisable 7,000,000    
Recognized excess tax benefit from the exercise of stock options 198,000 1,334,000 517,000
Stock Option Valuation Assumptions Detail [Table]      
Expected stock price volatility (minimum) 74.00% 72.00% 72.00%
Expected stock price volatility (maximum) 75.00% 75.00% 73.00%
Expected life of options 4 years 292 days 4 years 256 days 4 years 256 days
Risk free interest rate (minimum) 0.062% 0.87% 1.30%
Risk free interest rate (maximum) 1.03% 2.24% 2.80%
Expected dividend yield 0.00% 0.00% 0.00%
Weighted average fair value of options granted $ 4.06 $ 7.55 $ 6
Total estimated unrecognized compensation cost $ 7,800,000    
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 73 days    
Shares surrendered in payment of option exercise 81,616 592,992 630
Shares surrendered related to restricted stock vesting 24,121 52,065 6,048
Maximum number of shares issuable under stock options outstanding and stock options authorized for future grants 6,178,178