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Net Income (Loss) Per Share (Reconciliation of 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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income (loss) $ 17,656 $ (34,838) $ 34,356 $ (94,061)
Net income allocated to participating securities (60) 0 (117) 0
Net income allocable to common stock for basic net income (loss) per share 17,596 (34,838) 34,239 (94,061)
Adjustment to net income allocated to participating securities 4 0 7 0
Net income allocable to common stock for diluted net income (loss) per share $ 17,600 $ (34,838) $ 34,246 $ (94,061)
Weighted-average shares of common stock outstanding (in shares) 293,188 229,310 292,029 228,860
Dilutive securities:        
Outstanding stock options, unvested RSUs and ESPP contributions (in shares) 18,031 0 18,730 0
Weighted-average shares of common stock outstanding and dilutive securities (in shares) 311,219 229,310 310,759 228,860
Net income (loss) per share, basic (in dollars per share) $ 0.06 $ (0.15) $ 0.12 $ (0.41)
Net income (loss) per share, diluted (in dollars per share) $ 0.06 $ (0.15) $ 0.11 $ (0.41)