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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 |

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