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Stock-Based Compensation and Other Plans (Details) (USD $)
12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Former CEO and former CFO
Dec. 31, 2012
All grants excluding those to Company's CEO outside of Incentive Plan
Dec. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Dec. 31, 2010
Stock options
Dec. 31, 2009
Stock options
Jun. 30, 2011
Stock options
CEO
Dec. 31, 2011
Stock options
CEO
Dec. 31, 2012
Stock options
All grants excluding those to Company's CEO outside of Incentive Plan
Dec. 31, 2012
Restricted stock awards
Dec. 31, 2011
Restricted stock awards
Dec. 31, 2010
Restricted stock awards
Dec. 31, 2009
Restricted stock awards
Dec. 31, 2012
Restricted stock units
Dec. 31, 2011
Restricted stock units
Dec. 31, 2010
Restricted stock units
Dec. 31, 2009
Restricted stock units
Jun. 30, 2011
Restricted stock units
CEO
Dec. 31, 2012
Restricted stock units
All grants excluding those to Company's CEO outside of Incentive Plan
Dec. 31, 2010
Restricted stock and restricted stock units
Dec. 31, 2012
Restricted stock and restricted stock units
Sep. 21, 2010
Unvested restricted stock units and options
Senior executive
Dec. 31, 2012
Liability classified awards
Dec. 31, 2011
Liability classified awards
Dec. 31, 2010
Liability classified awards
Jun. 16, 2009
Incentive Plan
Jun. 05, 2008
Incentive Plan
Dec. 31, 2012
Incentive Plan
Jun. 16, 2009
2003 Directors Plan
Stock-Based Compensation Plans                                                                
Shares authorized for issuance 48,785,164                                                             2,000,000
Share awards used:                                                                
Shares granted and outstanding           9,114,148 9,107,339 6,099,403 4,627,311     8,114,148                                        
Shares granted and unvested                         6,751,730 6,113,731 11,410,496 11,204,545 3,959,247 7,990,602 6,191,334 7,073,709   3,292,580                    
Shares granted and vested                                 764,643                              
Total share awards used         18,923,101                                                      
Shares available for future awards         29,862,063                                                      
Options granted (in shares)           666,668 4,373,686 2,722,092   1,000,000 1,000,000                                          
Granted (in shares)                                         700,000                      
Stock-based compensation expense (in dollars) $ 6,800,000 $ 15,100,000 $ 54,300,000                                             $ 0 $ 0 $ 12,500,000        
Tax benefit recognized related to stock-based compensation expense (in dollars) 0 6,400,000 23,700,000                                                          
Vesting period           3 years                                   3 years                
Additional stock-based compensation expense recognized due to separations and modifications (in dollars)     34,200,000 12,700,000                                     6,700,000   2,300,000              
Total compensation expense related to non-vested awards not yet recognized (in dollars)                         11,200,000                                      
Remaining weighted average vesting period for recognition of compensation expense                         1 year 8 months 12 days                                      
Actual tax benefit realized for the tax deductions for share-based compensation (in dollars) $ 0 $ 8,100,000 $ 9,000,000                                                          
Additional shares authorized                                                         5,000,000 10,675,000    
Percentage of number of shares of common stock issued and outstanding immediately prior to the grant used to calculate the maximum award                                                             0.25  
Number of shares used to calculate the maximum award                                                             15,675,000  
Number of shares available for issuance before additional shares were approved                                                               100,000
Expiration term           6 years