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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
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income (Numerator) [Abstract]      
Income available to common shareholders $ 3,468    
Income available to common shareholders, plus assumed conversions $ 3,468    
Shares (Denominator) [Abstract]      
Shares used in computing basic net income per share (in shares) 122,861 120,598  
Effect of Diluted Securities [Abstract]      
Shares issuable related to our ESPP (in shares) 60    
Shares used in computing diluted net income per share (in shares) 124,972 120,598  
Per-Share Amount [Abstract]      
Basic net income (loss) per share (in dollars per share) $ 0.03 $ (0.52)  
Diluted net income (loss) per share (in dollars per share) $ 0.03 $ (0.52)  
2 3/4 Percent Convertible Senior Notes [Member]      
Convertible Senior Notes [Abstract]      
Interest rate on convertible senior notes 2.75%    
1 Percent Convertible Senior Notes [Member]      
Convertible Senior Notes [Abstract]      
Interest rate on convertible senior notes 1.00%   1.00%
Stock Options [Member]      
Effect of Diluted Securities [Abstract]      
Shares issuable related to stock-based compensation (in shares) 1,674    
Restricted Stock Awards [Member]      
Effect of Diluted Securities [Abstract]      
Shares issuable related to stock-based compensation (in shares) 377