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Significant Accounting Policies, Basic and Diluted Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income (Numerator) [Abstract]          
Income available to common shareholders   $ 35,648   $ 18,931  
Dilutive effect of 2 3/4 percent notes   1,047      
Income available to common shareholders, plus assumed conversions   $ 36,695   $ 18,931  
Shares (Denominator) [Abstract]          
Shares used in computing basic net income per share (in shares) 120,798 119,742 120,698 119,348  
Effect of Diluted Securities [Abstract]          
Shares issuable upon exercise of stock options (in shares)   3,974   4,310  
Shares issuable upon restricted stock award issuance (in shares)   376   399  
Shares issuable related to our ESPP (in shares)   4   4  
Shares issuable related to our 2 3/4 percent notes (in shares)   3,683      
Shares used in computing diluted net income per share (in shares) 120,798 127,779 120,698 124,061  
Per-Share Amount [Abstract]          
Basic net income (loss) per share (in dollars per share) $ (0.47) $ 0.30 $ (0.99) $ 0.16  
Diluted net income (loss) per share (in dollars per share) $ (0.47) $ 0.29 $ (0.99) $ 0.15  
2 3/4 Percent Convertible Senior Notes [Member]          
Basic and Diluted Net Loss per Share [Abstract]          
Interest rate on convertible senior notes 2.75% 2.75% 2.75% 2.75% 2.75%
1 Percent Convertible Senior Notes [Member]          
Basic and Diluted Net Loss per Share [Abstract]          
Interest rate on convertible senior notes 1.00% 1.00% 1.00% 1.00% 1.00%