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Net income (loss) per share - Basic and Diluted Net Income per Share Attributable to Common Stockholders (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
Numerator:        
Net income (loss) $ (104,068) $ 18,799 $ (303,294) $ 70,582
Denominator:        
Weighted-average common shares—basic for Class A and Class B common stock (shares) 140,124 135,800 138,875 133,755
Effect of potentially dilutive shares (shares) 0 10,255 0 13,446
Weighted-average common shares—diluted for Class A and Class B common stock (shares) 140,124 146,055 138,875 147,201
Net income per share attributable to common stockholders - Basic (in dollars per share) $ (0.74) $ 0.14 $ (2.18) $ 0.53
Net income per share attributable to common stockholders - Diluted (in dollars per share) $ (0.74) $ 0.13 $ (2.18) $ 0.48