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Net Income Per Share Attributable to Sterling Common Stockholders (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income attributable to Sterling common stockholders (amounts in thousands, except per share data):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Sterling common stockholders | $ | 8,915 |  |  | $ | 7,132 |  |  | $ | 19,580 |  |  | $ | 8,537 |
Weighted average common shares outstanding — basic | 26,908 |  |  | 26,486 |  |  | 26,893 |  |  | 25,787 |
Shares for dilutive unvested stock and warrants | 387 |  |  | 434 |  |  | 281 |  |  | 473 |
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted | 27,295 |  |  | 26,920 |  |  | 27,174 |  |  | 26,260 |
Basic income per share attributable to Sterling common stockholders | $ | 0.33 |  |  | $ | 0.27 |  |  | $ | 0.73 |  |  | $ | 0.33 |
Diluted income per share attributable to Sterling common stockholders | $ | 0.33 |  |  | $ | 0.26 |  |  | $ | 0.72 |  |  | $ | 0.33 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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