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Net income per share attributable to common stockholders - 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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income $ 18,799 $ 14,620 $ 70,582 $ 5,828
Less: net income allocable to participating securities 0 (36) 0 (1,022)
Numerator:        
Net income attributable to common stockholders—basic 18,799 14,584 70,582 4,806
Add: net income allocable to dilutive participating securities 0 1 0 10
Net income attributable to common stockholders—diluted $ 18,799 $ 14,585 $ 70,582 $ 4,816
Denominator:        
Weighted-average common shares—basic (in shares) 135,800 125,713 133,755 96,905
Weighted-average common shares—diluted (in shares) 146,055 145,186 147,201 115,578
Net income per share attributable to common stockholders - Basic (in dollars per share) $ 0.14 $ 0.12 $ 0.53 $ 0.05
Net income per share attributable to common stockholders - Diluted (in dollars per share) $ 0.13 $ 0.10 $ 0.48 $ 0.04
Common Class A [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income $ 13,849 $ 2,395 $ 46,561 $ 417
Less: net income allocable to participating securities 0 (6) 0 (73)
Numerator:        
Net income attributable to common stockholders—basic 13,849 2,389 46,561 344
Add: net income allocable to dilutive participating securities 0 1 0 10
Reallocation of net income 4,950 12,195 24,021 4,462
Net income attributable to common stockholders—diluted $ 18,799 $ 14,585 $ 70,582 $ 4,816
Denominator:        
Weighted-average common shares—basic (in shares) 100,040 20,597 88,234 6,941
Conversion of Class B to Class A common stock outstanding (in shares) 35,760 105,116 45,521 89,964
Effect of potentially dilutive stock options, ESPP shares and RSUs (in shares) 10,255 19,473 13,446 18,673
Weighted-average common shares—diluted (in shares) 146,055 145,186 147,201 115,578
Net income per share attributable to common stockholders - Basic (in dollars per share) $ 0.14 $ 0.12 $ 0.53 $ 0.05
Net income per share attributable to common stockholders - Diluted (in dollars per share) $ 0.13 $ 0.10 $ 0.48 $ 0.04
Common Class B [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income $ 4,950 $ 12,225 $ 24,021 $ 5,411
Less: net income allocable to participating securities 0 (30) 0 (949)
Numerator:        
Net income attributable to common stockholders—basic 4,950 12,195 24,021 4,462
Add: net income allocable to dilutive participating securities $ 0 4 $ 0 130
Reallocation of net income 0 0
Net income attributable to common stockholders—diluted $ 5,910 $ 12,199 $ 28,236 $ 4,592
Denominator:        
Weighted-average common shares—basic (in shares) 35,760 105,116 45,521 89,964
Conversion of Class B to Class A common stock outstanding (in shares) 0 0 0 0
Effect of potentially dilutive stock options, ESPP shares and RSUs (in shares) 10,159 19,317 13,366 18,621
Weighted-average common shares—diluted (in shares) 45,919 124,433 58,887 108,585
Net income per share attributable to common stockholders - Basic (in dollars per share) $ 0.14 $ 0.12 $ 0.53 $ 0.05
Net income per share attributable to common stockholders - Diluted (in dollars per share) $ 0.13 $ 0.10 $ 0.48 $ 0.04
Class B [Member]        
Numerator:        
Reallocation of net income $ 960   $ 4,215