12. EARNINGS PER COMMON SHARE

The following represents the calculation of earnings (loss) per share (in thousands, except per share amounts):


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Basic:
Net income (loss)	$	(640,844)	$	(16,274)	$	(977,403)	$	(18,872)
Weighted average basic number of common shares outstanding		159,050		157,943		158,801		155,925
Basic net income (loss) per share of common stock	$	(4.03)	$	(0.10)	$	(6.15)	$	(0.12)
Diluted:
Net income (loss)	$	(640,844)	$	(16,274)	$	(977,403)	$	(18,872)
Weighted average basic number of common shares outstanding		159,050		157,943		158,801		155,925
Common stock equivalent shares representing shares issuable upon:
Exercise of stock options		Anti-dilutive		Anti-dilutive		Anti-dilutive		Anti-dilutive
Exercise of warrants		Anti-dilutive		Anti-dilutive		Anti-dilutive		Anti-dilutive
Vesting of restricted shares		Anti-dilutive		Anti-dilutive		Anti-dilutive		Anti-dilutive
Weighted average diluted number of common shares outstanding		159,050		157,943		158,801		155,925
Diluted net income (loss) per share of common stock	$	(4.03)	$	(0.10)	$	(6.15)	$	(0.12)

Common stock equivalents, including stock options, restricted shares and warrants totaling 15.7 million and 15.3 million shares for the three and six months ended June 30, 2019, respectively, were not included in the computation of diluted earnings per share of common stock because the effect would have been anti-dilutive due to the net losses.

Common stock equivalents, including stock options, restricted shares and warrants totaling 14.9 million and 14.0 million shares for the three and six months ended June 30, 2018, respectively, were not included in the computation of diluted earnings per share of common stock because the effect would have been anti-dilutive due to the net losses.