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Net Income Per Share (Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net Income Per Share [Abstract]    
Net income $ 49,433 $ 46,293
Net income attributable to unvested awarded performance stock (1,499) (1,391)
Net income attributable to common shares $ 47,934 $ 44,902
Weighted average number of common shares outstanding - basic 143,347 142,637
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (4,346) (4,286)
Weighted average number of common shares outstanding for basic earnings per common share 139,001 138,351
Dilutive effect of stock options 2,499 2,297
Weighted average number of shares outstanding - diluted 141,500 140,648
Net income per share: Basic $ 0.34 $ 0.32
Net income per share: Diluted $ 0.34 $ 0.32