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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income attributable to Sterling common stockholders	$ 7,957	$ 8,917	$ 17,600	$ 19,580
Denominator:
Weighted average common shares outstanding - basic (in shares)	26,365	26,908	26,359	26,893
Shares for dilutive unvested stock and warrants (in shares)	272	387	302	281
Weighted average common shares outstanding - diluted (in shares)	26,637	27,295	26,661	27,174
Basic net income per share attributable to Sterling common stockholders (in dollars per share)	$ 0.30	$ 0.33	$ 0.67	$ 0.73
Diluted net income per share attributable to Sterling common stockholders (in dollars per share)	$ 0.30	$ 0.33	$ 0.66	$ 0.72

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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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