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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Apr. 30, 2014
Senior Notes Due 2019 [Member]
Numerator:          
Net income $ 47,532 $ 76,730 $ 156,495 $ 200,879  
Denominator:          
Denominator for basic earnings per share - weighted-average shares outstanding 164,229 187,459 172,622 187,120  
Effect of dilutive employee stock awards 1,484 1,521 1,401 1,710  
Denominator for diluted earnings per share - weighted-average shares outstanding 165,713 188,980 174,023 188,830  
Basic earnings per share (in dollars per share) $ 0.29 $ 0.41 $ 0.91 $ 1.07  
Diluted earnings per share (in dollars per share) $ 0.29 $ 0.41 $ 0.90 $ 1.06  
Anti-dilutive weighted-average shares from stock awards 2,807 3,286 3,287 3,851  
Convertible debt, conversion price (in dollars per share)         $ 90.00