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Net Income Per Share (Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding) (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Net Income Per Share [Abstract]    
Net income$ 44,173$ 44,293$ 127,501$ 129,606
Net income attributable to unvested awarded performance stock(1,395)(1,361)(3,959)(4,050)
Net income attributable to common shares$ 42,778$ 42,932$ 123,542$ 125,556
Weighted average basic number of common shares outstanding143,212142,472142,913142,247
Less unvested awarded performance stock included in weighted average basic shares outstanding(4,522)(4,379)(4,438)(4,445)
Weighted average number of common shares outstanding for basic earnings per common share138,690138,093138,475137,802
Dilutive effect of stock options1,7531,4141,6451,326
Weighted average number of shares outstanding140,443139,507140,120139,128
Basic$ 0.31$ 0.31$ 0.89$ 0.91
Diluted$ 0.30$ 0.31$ 0.88$ 0.90