Beginning in March 2019, we use the two-class method to calculate earnings per share (“EPS”) as the unvested restricted stock awards outstanding under our equity incentive plan are participating shares with nonforfeitable rights to dividends. Under the two-class method, we compute earnings per share of Common Stock by dividing the sum of distributed earnings to common stockholders (currently not applicable as we do not pay dividends) and undistributed earnings allocated to common stockholders by the weighted average number of outstanding shares of Common Stock for the period. In applying the two-class method, we allocate undistributed earnings to both shares of Common Stock and participating securities based on the number of weighted average shares outstanding during the period. Any undistributed losses are not allocated to unvested restricted stock as the restricted stockholders are not obligated to share in the losses. Following is a reconciliation of the numerator and denominator of basic and diluted earnings per share for the three and nine months ended September 30, 2019 and 2018:

(In thousands except per share data)	Three Months Ended September 30,					Nine Months Ended September 30,
	2019			2018		2019			2018
Numerator:
Income from continuing operations - numerator for earnings per share	$	13,920		$	25,357	$	36,271		$	69,375
Income from discontinued operations - numerator for earnings per share		—			—		—			901
Net income allocated to unvested restricted stock		(63	)		—		(140	)		—
Net income allocated to shares of Common Stock	$	13,857		$	25,357	$	36,131		$	70,276

Denominator:
Shares used for basic income per share		47,923			40,010		45,996			39,898
Effect of dilutive stock options and restricted stock units outstanding:
Non-qualified stock options		64			242		94			277
Restricted stock units		597			263		495			333
Market stock units		—			468		—			497
Warrants related to Cash Convertible Notes		—			1,844		—			2,229
Shares used for diluted income per share		48,584			42,827		46,585			43,234

Earnings per share - basic:
Continuing operations	$	0.29		$	0.63	$	0.79		$	1.74
Discontinued operations	$	—		$	—	$	—		$	0.02
Net income	$	0.29		$	0.63	$	0.79		$	1.76

Earnings per share - diluted:
Continuing operations	$	0.29		$	0.59	$	0.78		$	1.60
Discontinued operations	$	—		$	—	$	—		$	0.02
Net income	$	0.29		$	0.59	$	0.78		$	1.63

Dilutive securities outstanding not included in the computation of earnings per share because their effect is anti-dilutive:
Non-qualified stock options		70			81		74			47
Restricted stock units		276			47		207			34
Restricted stock awards		156			—		94			—

Market stock units and performance stock units outstanding are considered contingently issuable shares, and certain of these stock units were excluded from the calculations of diluted earnings per share for all periods presented as the performance criteria had not been met as of the end of the reporting periods.