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Employee Benefit Benefits and Stock-Based Compensation - Defined Contribution (Details) (401(k) Match Expense, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
year
Dec. 31, 2011
Dec. 31, 2010
Schedule of Defined Contribution Plans Disclosures        
Defined Contribution Plan, Maximum Annual Contribution Per Employee $ 17,500 $ 17,000    
Defined Contribution Plan, Vesting Period (in years)   3    
Defined Contribution Plan, Vesting Percentage After Vesting Period   100.00%    
Defined Contribution Plan, Cost Recognized   23,000,000 13,000,000 11,000,000
After March 6, 2009
       
Schedule of Defined Contribution Plans Disclosures        
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percentage   100.00%    
Defined Contribution Plan, Employer Matching Contribution, Percentage   3.00%    
After January 1, 2012
       
Schedule of Defined Contribution Plans Disclosures        
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percentage   100.00%    
Defined Contribution Plan, Employer Matching Contribution, Percentage   4.00%    
All Other Defined Contribution
       
Schedule of Defined Contribution Plans Disclosures        
Defined Contribution Plan, Cost Recognized   $ 7,000,000 $ 2,000,000