11. EARNINGS PER COMMON SHARE

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Basic:
Net income (loss) available to common stockholders	$	(16,274	)	$	(27,029	)	$	(18,872	)	$	161,522


Weighted average basic number of common shares outstanding		157,943			143,545			155,925			117,554

Basic net income (loss) per share of common stock	$	(0.10	)	$	(0.19	)	$	(0.12	)	$	1.37


Diluted:
Net income (loss) available to common stockholders	$	(16,274	)	$	(27,029	)	$	(18,872	)	$	161,522


Weighted average basic number of common shares outstanding		157,943			143,545			155,925			117,554
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			655
Conversion of preferred stock		—			Anti-dilutive			—			Anti-dilutive

Weighted average diluted number of common shares outstanding		157,943			143,545			155,925			118,209

Diluted net income (loss) per share of common stock	$	(0.10	)	$	(0.19	)	$	(0.12	)	$	1.37

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.

Common stock equivalents, including stock options, restricted shares, warrants, and preferred stock totaling 18.1 million and 14.8 million shares for the three and six months ended June 30, 2017, respectively, were not included in the computation of diluted earnings per share of common stock because the effect would have been anti-dilutive.