

12.	Net Income (Loss) Per Share Attributable to Sterling Common Stockholders

Basic net income (loss) per share attributable to Sterling common stockholders is computed by dividing net income (loss) attributable to Sterling common stockholders by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share attributable to Sterling common stockholders is the same as basic net income (loss) per share attributable to Sterling common stockholders but includes dilutive unvested stock awards and warrants using the treasury stock method. The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income (loss) attributable to Sterling common stockholders (amounts in thousands, except per share data):



	Three Months Ended March 31,
	2018		2017
Numerator:
Net income (loss) attributable to Sterling common stockholders	$	2,489	$	(2,257	)
Weighted average common shares outstanding — basic	26,854		25,022
Shares for dilutive unvested stock and warrants	224		—
Weighted average common shares outstanding and incremental shares assumed repurchased— diluted	27,078		25,022
Basic income (loss) per share attributable to Sterling common stockholders	$	0.09	$	(0.09	)
Diluted income (loss) per share attributable to Sterling common stockholders	$	0.09	$	(0.09	)

In accordance with the treasury stock method, approximately 0.5 million shares of unvested common stock were excluded from the diluted weighted average common shares outstanding for the three months ended March 31, 2017, as the Company incurred a loss during that period and the impact of such shares would have been anti-dilutive.