Income (Loss) Per Common Share

Basic and diluted income (loss) per common share for the three months ended March 31, 2018 and 2017 were calculated as follows (in thousands, except number of shares and per share amounts):



	Three Months Ended March 31, 2018		Three Months Ended March 31, 2017
Basic weighted average number of common shares outstanding	37,931,256		36,908,320
Effect of dilutive securities:
Stock options, unvested common shares, and warrants	1,924,427		—
Diluted average shares outstanding	39,855,683		36,908,320
Net income (loss) available to common stockholders	$	8,328	$	(10,000	)
Basic income (loss) per common share	$	0.22	$	(0.27	)
Dilutive income (loss) per common share	$	0.21	$	(0.27	)
Antidilutive securities not included in the calculation of diluted income (loss) per common share (weighted average):
Stock options, unvested common shares, and warrants	—		825,038
Tangible equity units	—		463,635
Unvested stock options	—		240,000
Warrants	—		1,907,551

Diluted loss per share for the three months ended March 31, 2017 is the same as basic loss per share as there is a net loss in the period and inclusion of potentially issuable shares is anti-dilutive. Therefore, the weighted-average number of shares outstanding used in the computation of diluted loss per share does not include the effect of the above anti-dilutive shares.