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EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2017 | Sep. 28, 2016 | Sep. 27, 2017 | Sep. 28, 2016
Numerator: |  |  |  |
Document period end date |  |  | Sep. 27, 2017 |
Net income | $ 7,870 | $ 6,789 | $ 19,916 | $ 16,689
Less: net income attributable to non-controlling interests | 2,873 | 3,023 | 7,773 | 8,163
NET INCOME ATTRIBUTABLE TO SHAKE SHACK INC. | $ 4,997 | $ 3,766 | $ 12,143 | $ 8,526
Denominator: |  |  |  |
Weighted-average shares of Class A common stock outstanding—basic (in shares) | 26,024 | 24,023 | 25,733 | 22,310
Effect of dilutive securities: |  |  |  |
Weighted-average shares of Class A common stock outstanding—diluted (in shares) | 26,477 | 24,554 | 26,248 | 22,805
Earnings (loss) per share of Class A common stock—basic (in dollars per share) | $ 0.19 | $ 0.16 | $ 0.47 | $ 0.38
Earnings (loss) per share of Class A common stock—diluted (in dollars per share) | $ 0.19 | $ 0.15 | $ 0.46 | $ 0.37
Performance stock units |  |  |  |
Effect of dilutive securities: |  |  |  |
Stock options (in shares) | 26 | 0 | 24 | 0
Restricted Stock Units (RSUs) [Member] |  |  |  |
Effect of dilutive securities: |  |  |  |
Stock options (in shares) | 16 | 0 | 5 | 0
Employee Stock Option |  |  |  |
Effect of dilutive securities: |  |  |  |
Stock options (in shares) | 411 | 531 | 486 | 495

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