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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income (Numerator) [Abstract]          
Income available to common shareholders $ 7,351        
Effect of Diluted Securities [Abstract]          
Shares exercisable upon exercise of stock options 0        
Shares issuable upon restricted stock award issuance 0        
Shares issuable related to our ESPP 0        
Income available to common shareholders, plus assumed conversions $ 7,351        
Shares (Denominator) [Abstract]          
Shares used in computing basic net income per share (in shares) 120,989 119,979 120,795 119,348  
Effect of Diluted Securities [Abstract]          
Shares issuable upon exercise of stock options (in shares) 2,129        
Shares issuable upon restricted stock award issuance (in shares) 202        
Shares issuable related to our ESPP (in shares) 58        
Shares used in computing diluted net income per share (in shares) 123,378 119,979 120,795 119,348  
Per-Share Amount [Abstract]          
Basic net income (loss) per share (in dollars per share) $ 0.06 $ (0.30) $ (0.93) $ (0.14)  
Diluted net income (loss) per share (in dollars per share) $ 0.06 $ (0.30) $ (0.93) $ (0.14)  
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%