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Share-Based Compensation (Details 2) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
May 31, 2012
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2013
Restricted Shares
Dec. 31, 2012
Restricted Shares
Dec. 31, 2013
Performance Unit Awards
Dec. 31, 2013
Restricted stock units
Dec. 31, 2012
Restricted stock units
Dec. 31, 2013
Restricted stock units
Executive Officer
Dec. 31, 2013
Long-Term Incentive Plan
Dec. 31, 2013
Long-Term Incentive Plan
Stock Options
Dec. 31, 2012
Long-Term Incentive Plan
Stock Options
Dec. 31, 2011
Long-Term Incentive Plan
Stock Options
Dec. 31, 2010
Long-Term Incentive Plan
Stock Options
Dec. 31, 2013
Long-Term Incentive Plan
Restricted Shares
Dec. 31, 2012
Long-Term Incentive Plan
Restricted Shares
Dec. 31, 2011
Long-Term Incentive Plan
Restricted Shares
Dec. 31, 2010
Long-Term Incentive Plan
Restricted Shares
Dec. 31, 2012
Long-Term Incentive Plan
Restricted Stock
Share-based Compensation                                      
Common stock authorized for issuance (in shares)                   7,500,000 1,000,000                
Shares available for issuance                   6,787,341                  
Non-vested shares activity                                      
Non-vested at the beginning of the period (in shares)                             1,145,611 1,634,154 1,369,182    
Granted (in shares)                             2,600 318,508 826,959    
Vested (in shares)                             (709,959) (740,811) (557,355)    
Forfeited (in shares)                             (78,700) (66,240) (4,632)    
Non-vested at the end of the period (in shares)                             359,552 1,145,611 1,634,154    
Weighted-Average Grant-Date Fair Value                                      
Non-vested at the beginning of the period (in dollars per share)                             $ 23.24 $ 14.61 $ 10.94    
Granted (in dollars per share)                             $ 54.75 $ 43.66 $ 18.79    
Vested (in dollars per share)                             $ 18.73 $ 13.59 $ 11.83    
Forfeited (in dollars per share)                             $ 42.80 $ 16.54 $ 8.67    
Non-vested at the end of the period (in dollars per share)                             $ 28.09 $ 23.24 $ 14.61    
Stock option activity                                      
Options outstanding at the beginning of the period (in shares)                     0 22,900 22,900            
Granted (in shares)                     0 0 0            
Exercised (in shares) (22,900)                     (22,900) 0            
Forfeited (in shares)                       0 0            
Expired (in shares)                       0 0            
Options outstanding at the end of the period (in shares)                       0 22,900 22,900          
Weighted-Average Exercise Price                                      
Options outstanding at the beginning of the period (in dollars per share)                     $ 0.00 $ 18.03 $ 18.03            
Granted (in dollars per share)                       $ 0.00 $ 0.00            
Exercised (in dollars per share)                       $ 0.00 $ 0.00            
Forfeited (in dollars per share)                       $ 0.00 $ 0.00            
Expired (in dollars per share)                       $ 0.00 $ 0.00            
Options outstanding at the end of the period (in dollars per share)                       $ 0.00 $ 18.03 $ 18.03          
Weighted-Average Remaining Contractual Term                                      
Aggregate Intrinsic Value                             $ 15,600,000 $ 55,900,000 $ 30,600,000 $ 20,800,000  
Options outstanding at the end of the period                         7 years 4 months 6 days 8 years 4 months 6 days          
Other disclosures                                      
Vesting period             3 years 3 years 1 year           3 years        
Number of shares right to receive cash payment on vesting equal to fair market value is received per award                             1        
Portion of stock awards vested per year for Company employees               0.3333                      
Offer price per share received as cash settlement on restricted stock awards vested in 2012                               $ 30.00      
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   9,900,000                           12,400,000      
Unrecognized compensation cost                               4,900,000      
Weighted-average period for amortization of unrecognized compensation cost                                     1 year 2 months 12 days
Compensation expense           3,900,000         0 0 8,000   13,200,000 36,900,000 9,800,000    
Liability for unvested restricted share awards   51,200,000 45,800,000 8,900,000 19,500,000                            
Cash paid to settle liability-classified awards upon vesting       $ 23,800,000 $ 22,200,000