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Net Income Per Share Attributable to Sterling Common Stockholders - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to Sterling common stockholders	$ 8,176	$ 3,662	$ 10,663	$ 1,405
Weighted average common shares outstanding, basic (in shares)	26,887	26,978	26,881	25,972
Shares for dilutive unvested stock and warrants (in shares)	238	358	281	437
Weighted average common shares outstanding and incremental shares assumed repurchased, diluted (in shares)	27,125	27,336	27,162	26,409
Basic income (loss) per share attributable to Sterling common stockholders (USD per share)	$ 0.30	$ 0.14	$ 0.40	$ 0.05
Diluted income (loss) per share attributable to Sterling common stockholders (USD per share)	$ 0.30	$ 0.13	$ 0.39	$ 0.05

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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