v2.4.0.8
Net Income Per Share , Calculation of Basic and Diluted (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Line Items]      
Net income $ 44,273 $ 66,836 $ 62,492
Basic shares:      
Weighted-average common shares outstanding-basic (in shares) 162,435 158,074 152,581
Diluted shares:      
Weighted-average common shares outstanding-basic (in shares) 162,435 158,074 152,581
Effect of potentially dilutive securities:      
Weighted-average shares used to compute diluted net income per share (in shares) 168,183 166,329 163,781
Basic (in dollars per share) $ 0.27 $ 0.42 $ 0.41
Diluted (in dollars per share) $ 0.26 $ 0.40 $ 0.38
Stock Options [Member]
      
Effect of potentially dilutive securities:      
Employee stock options and purchase rights (in shares) 5,685 8,214 11,200
Restricted Stock Units (RSUs) [Member]
      
Effect of potentially dilutive securities:      
Employee stock options and purchase rights (in shares) 35 0 0
ESPP [Member]
      
Effect of potentially dilutive securities:      
Employee stock options and purchase rights (in shares) 28 41 0