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Share-Based Compensation (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2012
Jun. 30, 2010
Mar. 31, 2012
Long-Term Incentive Plan
Mar. 31, 2011
Long-Term Incentive Plan
Mar. 31, 2012
Long-Term Incentive Plan
Restricted Stock
year
Stock option activity          
Granted (in shares) 32,350        
Vested (in shares) 29,201        
Forfeited (in shares)   3,149      
Expired (in shares) 6,301        
Options outstanding (in shares) 22,900        
Non-vested shares activity          
Non-vested at the beginning of the period (in shares)         1,634,154
Granted (in shares)         44,662
Forfeited (in shares)         (19,333)
Non-vested at the end of the period (in shares)         1,659,483
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)         $ 21.57
Forfeited (in dollars per share)         $ 10.21
Non-vested at the end of the period (in dollars per share)         $ 14.73
Other disclosures          
Unrecognized compensation cost         $ 17,000,000
Weighted-average period for amortization of unrecognized compensation cost (in years)         2
Compensation expense     $ 3,300,000 $ 2,200,000  
Vesting period (in years)         3 years