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Shareholders' Equity (Details 4) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2011
Unvested Restricted Stock
Y
Dec. 31, 2010
Unvested Restricted Stock
Y
Dec. 31, 2009
Unvested Restricted Stock
Y
Dec. 31, 2008
Unvested Restricted Stock
Y
Dec. 31, 2011
RSUs
Y
Dec. 31, 2010
RSUs
Y
Dec. 31, 2009
RSUs
Y
Dec. 31, 2008
RSUs
Y
Dec. 31, 2011
RSUs
Non-employee director
Y
Mar. 31, 2009
Special bonus award
Unvested Restricted Stock Outstanding                    
Balance at the beginning of the period (in shares) 386,000 419,000 611,000              
Granted (in shares) 353,000       224,000 343,000 639,000      
Vested (in shares) (284,000) (26,000) (135,000)              
Forfeited (in shares) (9,000) (7,000) (57,000)   (26,000) (15,000) (13,000)      
Balance at the end of the period (in shares) 446,000 386,000 419,000 611,000         107,000  
Weighted Average Grant-date Fair Value Price                    
Balance at the beginning of the period (in dollars per share) $ 20.84 $ 20.88 $ 18.73              
Granted (in dollars per share) $ 37.40       $ 38.01 $ 28.32 $ 14.88      
Vested (in dollars per share) $ 20.49 $ 21.30 $ 12.43              
Forfeited (in dollars per share) $ 26.45 $ 20.95 $ 19.12   $ 16.19 $ 19.91 $ 13.70      
Balance at the end of the period (in dollars per share) $ 34.07 $ 20.84 $ 20.88 $ 18.73            
RSUs Outstanding                    
Balance at the beginning of the period (in shares)         1,218,000 901,000 285,000      
Granted (in shares) 353,000       224,000 343,000 639,000      
Issued (in shares)         (515,000) (11,000) (10,000)     (162,338)
Forfeited (in shares) (9,000) (7,000) (57,000)   (26,000) (15,000) (13,000)      
Balance at the end of the period (in shares)         901,000 1,218,000 901,000 285,000    
Weighted Average Grant-date Fair Value Price                    
Balance at the beginning of the period (in dollars per share)         $ 18.34 $ 14.52 $ 13.59      
Granted (in dollars per share) $ 37.40       $ 38.01 $ 28.32 $ 14.88      
Issued (in dollars per share)         $ (14.03) $ (14.03) $ (12.29)      
Forfeited (in dollars per share) $ 26.45 $ 20.95 $ 19.12   $ 16.19 $ 19.91 $ 13.70      
Balance at the end of the period (in dollars per share)         $ 25.59 $ 18.34 $ 14.52 $ 13.59    
Aggregate Intrinsic Value $ 18,707,000 $ 13,991,000 $ 11,245,000 $ 11,427,000 $ 37,373,000 $ 44,038,000 $ 24,131,000 $ 5,276,000    
Weighted Average Remaining Vesting Term (in years) 2.2 0.6 1.7 2.2 1.7 2.6 2.5 3.6    
Aggregate value of awards vested 10,600,000 1,000,000 3,600,000              
Percentage of shares to be issued on completion of one-year vesting period                 50.00%  
Value of shares issued                   $ 4,500,000
Vesting period (in years)                 1 year  
Percentage of shares to be issued that is deferred                 50.00%  
Deferral period for percentage of shares to be issued (in years)                 3