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Shareholders' Equity (Stock Options) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Equity [Abstract]      
Unrecognized compensation cost $ 12,900,000    
Weighted average period costs expected to be recognized 3.5    
Stock Options and Stock Appreciation Rights (SARs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value $ 10.43 $ 7.72 $ 7.03
Risk free interest rate 1.59% 2.07% 2.48%
Expected volatility rate 35.52% 36.72% 37.17%
Expected term of option (years) 6.3 6.4 6.2
Weighted average remaining contractual term, options outstanding (years) 4.3    
Weighted average remaining contractual term, options exercisable (years) 3.2    
Aggregate intrinsic value, options outstanding 5,500,000    
Aggregate intrinsic value, options exercisable 3,600,000    
Aggregate intrinsic value 2,000,000 1,200,000 200,000
Dividends paid on common stock 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of shares, Outstanding at December, 2010 2,337    
Number of shares, Granted 149    
Number of shares, Forfeited (18)    
Number of shares, Exercised (339)    
Number of shares, Outstanding at December, 2011 2,129 2,337  
Number of shares, Exercisable 1,639    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted average exercise price, Outstanding at December 31, 2010 $ 23.98    
Weighted average exercise price, Granted $ 27.63    
Weighted average exercise price, Forfeited $ 28.77    
Weighted average exercise price, Exercised $ 21.55    
Weighted average exercise price, Outstanding at December 31, 2011 $ 24.58 $ 23.98  
Weighted average exercise price, Exercisable at December 31, 2011 $ 25.08    
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of shares vested $ 3,600,000 $ 2,800,000 $ 1,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of shares, Outstanding at December 31, 2010 534    
Number of shares, Granted 294    
Number of shares, Vested (140)    
Number of shares, Forfeited (180)    
Number of shares, Outstanding at December 31, 2011 508 534  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted average exercise price, Outstanding at December 31, 2010 $ 20.54    
Weighted average exercise price, Granted $ 27.48 $ 19.26 $ 17.02
Weighted average exercise price, Forfeited $ 25.75    
Weighted average exercise price, Vested $ 21.65    
Weighted average exercise price, Outstanding at December 31, 2011 $ 23.43 $ 20.54