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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to Sterling common stockholders	$ 7,828	$ 8,174	$ 9,643	$ 10,663
Denominator:
Weighted average common shares outstanding - basic (in shares)	26,338	26,887	26,357	26,881
Shares for dilutive unvested stock and warrants (in shares)	285	238	300	281
Weighted average common shares outstanding and incremental shares assumed repurchased - diluted (in shares)	26,623	27,125	26,657	27,162
Basic net income per share attributable to Sterling common stockholders (in dollars per share)	$ 0.30	$ 0.30	$ 0.37	$ 0.40
Diluted net income per share attributable to Sterling common stockholders (in dollars per share)	$ 0.29	$ 0.30	$ 0.36	$ 0.39

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

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