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Earnings Per Share (Summary Of Earnings Per Share, Basic And Diluted) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Earnings Per Share Reconciliation [Line Items]    
Net income $ 42,079 $ 32,335
Weighted-average shares outstanding 81,702 78,575
Share-based payment awards classified as participating securities 863 1,362
Denominator for basic earnings per share 82,565 79,937
Dilutive securities 2,599 3,441
Denominator for diluted earnings per share 85,164 83,378
Basic earnings per share $ 0.51 $ 0.40
Diluted earnings per share $ 0.49 $ 0.39
Diluted earnings per share excludes antidilutive effect   100,000
Earnings Per Share, Basic [Member]
   
Earnings Per Share Reconciliation [Line Items]    
Net income $ 42,079 $ 32,335