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Stock-Based Compensation (Details) (USD $)
 12 Months Ended 0 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Stock options
Dec. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Dec. 31, 2013
Stock options
Minimum
Dec. 31, 2013
Stock options
Maximum
Jun. 01, 2003
2003 Plan
Jun. 01, 2003
2003 Plan
Incentive stock options
Jun. 01, 2003
2003 Plan
Nonqualified stock options
Jun. 09, 2011
2008 Plan
Dec. 31, 2013
2008 Plan
Jun. 09, 2011
2008 Plan
Stock options
Jun. 09, 2011
2008 Plan
Stock appreciation rights
Jun. 09, 2011
2008 Plan
Restricted stock and Other full value stock awards
Stock-based compensation                            
Number of shares of common stock available for awards             12,000,000     9,250,000        
Increase in number of shares of common stock available for awards                   2,350,000        
Exercise price per share as a percentage of the fair market value of the Common Stock               100.00% 85.00%          
Number of shares of common stock counted against the maximum shares available for grant for each share awarded under the plan                       1 1 2.44
Options available for future grants (in shares)                     872,105      
Exercise price of options granted, low end of range (in dollars per share) $ 2.83 $ 2.83                        
Exercise price of options granted, high end of range (in dollars per share) $ 14.41 $ 14.41                        
Contractual lives of options granted         7 years 10 years                
Number of Option Shares                            
Outstanding at the beginning of the period (in shares)   11,805,688                        
Granted (in shares)   0                        
Exercised (in shares)   (2,452,865)                        
Exchanged (in shares)   (2,022,985)                        
Canceled (in shares)   (13,125)                        
Outstanding at the end of the period (in shares)   7,316,713 11,805,688                      
Weighted-Average Exercise Price                            
Outstanding at the beginning of the period (in dollars per share)   $ 7.33                        
Exercised (in dollars per share)   $ 6.95                        
Exchanged (in dollars per share)   $ 7.14                        
Canceled (in dollars per share)   $ 6.64                        
Outstanding at the end of the period (in dollars per share)   $ 7.51 $ 7.33                      
Additional disclosures                            
Weighted-Average Remaining Contractual Term   3 years 4 months 6 days                        
Aggregate Intrinsic Value (in dollars)   $ 52,052,000                        
Weighted-average grant-date fair value of options granted (in dollars per share)     $ 17.19 $ 16.68                    
Aggregate intrinsic value of stock options exercised (in dollars)   46,000,000 23,200,000 9,500,000                    
Number of Option Shares   5,331,652                        
Weighted-Average Exercise Price (in dollars per share)   $ 7.24                        
Weighted-average remaining contractual term   2 years 11 months 23 days                        
Aggregate intrinsic value (in dollars)   $ 39,300,000