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Earnings Per Share (Computation Of Net Income Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic earnings per share:        
Net income $ 31,822 $ 7,675 $ 63,982 $ 9,255
Weighted-average common shares outstanding - Basic 59,108 55,541 57,769 55,508
Basic earnings per share (in dollars per share) $ 0.54 $ 0.14 $ 1.11 $ 0.17
Diluted earnings per share:        
Net income 31,822 7,675 63,982 9,255
Senior Convertible Notes interest expense, net of tax 0 49 49 146
Numerator for diluted earnings per share $ 31,822 $ 7,724 $ 64,031 $ 9,401
Shares used in computation:        
Weighted-average common shares outstanding - Basic 59,108 55,541 57,769 55,508
Senior Convertible Notes shares 0 2,331 956 2,331
Employee stock options 1,882 857 1,853 990
Weighted-average number of shares - Diluted 60,990 58,729 60,578 58,829
Diluted earnings per share (in dollars per share) $ 0.52 $ 0.13 $ 1.06 $ 0.16