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Stock-Based Compensation (Flexible Stock Plan Options) (Details)
Dec. 31, 2013
Dec. 31, 2012
Maximum Number of Authorized Shares    
Unexercised options 6,400,000 8,500,000
Outstanding stock units—unvested   1,600,000
Flexible Stock Plan
   
Shares Available for Issuance    
Unexercised options 6,400,000  
Outstanding stock units—vested 4,000,000  
Outstanding stock units—unvested 1,800,000  
Available for grant 7,800,000  
Authorized for issuance at December 31, 2013 20,000,000  
Maximum Number of Authorized Shares    
Unexercised options 6,400,000  
Outstanding stock units—vested 5,500,000  
Outstanding stock units—unvested 3,400,000  
Available for grant 7,800,000  
Authorized for issuance at December 31, 2013 23,100,000