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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Basic earnings per share:        
Net income $ 71,018 $ 29,471 $ 124,133 $ 32,160
Weighted-average common shares outstanding 59,996 58,192 59,907 57,089
Basic earnings per share (in dollars per share) $ 1.18 $ 0.51 $ 2.07 $ 0.56
Diluted earnings per share:        
Net income 71,018 29,471 124,133 32,160
Senior Convertible Notes interest expense, net of tax 0 0 0 49
Numerator for diluted earnings per share $ 71,018 $ 29,471 $ 124,133 $ 32,209
Shares used in computation:        
Weighted-average common shares outstanding 59,996 58,192 59,907 57,089
Senior Convertible Notes shares 0 564 0 1,442
Employee stock options 1,638 1,834 1,685 1,838
Weighted-average number of shares - Diluted 61,634 60,590 61,592 60,369
Diluted earnings per share (in dollars per share) $ 1.15 $ 0.49 $ 2.02 $ 0.53