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Share-Based Compensation (Details 3) (USD $)
 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
May 31, 2012
Jun. 30, 2012
Jun. 30, 2012
Long-Term Incentive Plan
Jun. 30, 2011
Long-Term Incentive Plan
Jun. 30, 2012
Long-Term Incentive Plan
Jun. 30, 2011
Long-Term Incentive Plan
Jun. 30, 2012
Long-Term Incentive Plan
Restricted Stock
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)             44,662  
Vested (in shares)             (85,349)  
Forfeited (in shares)             (19,333)  
Non-vested at the end of the period (in shares)             1,574,134  
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)             $ 21.58  
Vested (in dollars per share)             $ 10.92  
Forfeited (in dollars per share)             $ 10.21  
Non-vested at the end of the period (in dollars per share)             $ 15.06  
Other disclosures                
Unrecognized compensation cost             $ 23,100,000  
Weighted-average period for amortization of unrecognized compensation cost (in years)             2  
Vesting period (in years)             3 years  
Offer price per Share on restricted stock awards vested             $ 30  
Number of non-transferable contingent cash payments right for each restricted stock awards vested (in shares)             1  
Additional share based compensation incurred on modification of awards   9,924,000         12,400,000  
Compensation expense     $ 17,300,000 $ 2,500,000 $ 20,800,000 $ 4,700,000