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Stock Based Awards and Other Equity Instruments (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of stock options issued 3,651,000    
Grant date fair value per option $ 20.36    
Common stock authorized 10,000,000    
Conversion of Stock [Line Items]      
Maximum number of shares granted 7,000,000    
Stock Based Awards and Other Equity Instruments (Textual) [Abstract]      
Stock-based compensation $ 30,102,000 $ 17,344,000 $ 7,183,000
Total income tax benefit related to stock-based compensation expense 10,600,000 6,500,000 2,000,000
Modification expenses of vested stock options 8,000,000    
Warrants issued in spinoff not listed on recognized stock exchange 32,186,792    
Conversion of warrant into common stock 7,952,456    
Expiration date of conversion May 07, 2012    
One Tranche of Warrants [Member]
      
Conversion of Stock [Line Items]      
Exercise price of warrants prior to adjustment $ 12.23    
Common stock share exercisable for each warrant 25.00%    
Exercise price per warrant $ 6.48    
Other Tranche of Warrants [Member]
      
Conversion of Stock [Line Items]      
Exercise price of warrants prior to adjustment $ 14.45    
Common stock share exercisable for each warrant 25.00%    
Exercise price per warrant $ 7.66    
2012 Stock Warrants [Member]
      
Conversion of Stock [Line Items]      
Warrants Exercised 32,186,791 [1]    
Common stock issued in lieu of warrants 7,952,456    
Weighted average exercise price of warrants $ 27.11    
Outstanding warrants to purchase common stock 31,641,337    
Exercise proceeds received $ 214,500,000    
Cashless warrants exercised 545,454    
Weighted average exercise price of cashless warrants $ 25.92    
Warrants converted into common stock shares 0    
2012 Stock Warrants [Member] | Maximum [Member]
      
Conversion of Stock [Line Items]      
Warrants converted into common stock shares at spin-off 8,046,698    
2011 Incentive Plan [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Number of stock options issued   0 0
Stock Options [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period of stock options 4 years    
Stock options vest period 4 years    
Maximum number of stock options authorized for an individual 3,000,000    
Restricted Stock Units (RSU) [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period of stock options 5 years    
RSU's withheld to satisfy minimum tax withholding requirements 190,856    
RSU's issued under incentive plan 85,144    
Stock options vest period 5 years    
Fair value of RSU's issued $ 35.76    
RSU's awarded to non employee directors 200,000    
Maximum number of restricted stock authorized for an individual 2,000,000    
2012 Stock Option Activity [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Term of stock options, granted 10 years    
Stock appreciation rights 4 years    
Number of stock options issued 3,650,814    
Vested options and stock appreciation rights exercisable Period 4 years    
Grant date fair value per option $ 20.36    
Closing stock price $ 41.92    
2012 RSU Activity [Member]
      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Stock options vest period 2 years    
[1] Net of unrealized tax benefits of $72 for the year ended December 31, 2012.