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Shareholders' Equity (Details 3) (SSAR Awards, USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Dec. 31, 2008
Y
SSAR Awards
        
SSAR Awards Outstanding        
Balance at the beginning of the period (in shares) 1,012 2,061 3,789  
Granted (in shares)   36 48  
Exercised (in shares) (486) (1,085) (1,759)  
Forfeited (in shares) (9)   (17)  
Balance at the end of the period (in shares) 517 1,012 2,061 3,789
Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share) $ 16.1 $ 16.7 $ 15.06  
Granted (in dollars per share)   $ 24.89 $ 21.78  
Exercised (in dollars per share) $ (16.56) $ (17.52) $ (13.27)  
Forfeited (in dollars per share) $ (12.39)   $ (21.22)  
Balance at the end of the period (in dollars per share) $ 15.06 $ 16.1 $ 16.7 $ 15.06
Aggregate Intrinsic Value $ 13,921 $ 20,346 $ 20,914 $ 16,654
Weighted Average Remaining Vesting Term (in years) 1.4 1.9 2.1 2.4
SSAR Awards Exercisable        
SSAR Awards (in shares) 410 480 1,419 1,168
Weighted Average Exercise Price (in dollars per share) $ 15.39 $ 18.29 $ 17.62 $ 11.02
Aggregate Intrinsic Value 10,895 8,619 13,109 9,772
Weighted Average Remaining Contractual Life (in years) $ 1.4 $ 1.3 $ 1.6 $ 1.3
Aggregate intrinsic value of SSAR Awards exercised $ 10,200 $ 13,200 $ 16,100  
Assumptions used to determine weighted average fair value        
Weighted average fair value of SSAR Awards (in dollars per share)   $ 10.97 $ 9.33  
Expected term (in years)   4.0 4.0  
Volatility (as a percent)   58.00% 58.90%  
Dividend yields (as a percent)   0.50% 0.70%  
Risk-free interest rates (as a percent)   1.70% 1.90%