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Share-Based Compensation (Details 3) (USD $)
 1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
May 31, 2012
Sep. 30, 2012
Sep. 30, 2012
Long-Term Incentive Plan
Sep. 30, 2011
Long-Term Incentive Plan
Sep. 30, 2012
Long-Term Incentive Plan
Sep. 30, 2011
Long-Term Incentive Plan
Sep. 30, 2012
Long-Term Incentive Plan
Restricted stock and restricted stock units
year
May 31, 2012
Long-Term Incentive Plan
Stock Options
Share-based Compensation                
Exercise of stock options (in shares) 22,900             22,900
Non-vested shares activity                
Non-vested at the beginning of the period (in shares)             1,634,154  
Granted (in shares)             50,837  
Vested (in shares)             (268,012)  
Forfeited (in shares)             (62,040)  
Non-vested at the end of the period (in shares)             1,354,939  
Weighted-Average Grant-Date Fair Value                
Non-vested at the beginning of the period (in dollars per share)             $ 14.61  
Granted (in dollars per share)             $ 22.52  
Vested (in dollars per share)             $ 8.38  
Forfeited (in dollars per share)             $ 16.68  
Non-vested at the end of the period (in dollars per share)             $ 16.05  
Other disclosures                
Unrecognized compensation cost             $ 17,000,000  
Weighted-average period for amortization of unrecognized compensation cost (in years)             2  
Vesting period             3 years  
Offer price per Share on restricted stock awards vested in 2012             $ 30  
Number of non-transferable contingent cash payments right for each restricted stock awards vested in 2012 (in shares)             1  
Additional share based compensation incurred on modification of awards   9,924,000         12,400,000  
Compensation expense     $ 6,000,000 $ 2,000,000 $ 26,800,000 $ 6,700,000