EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2021

The following table presents the computation of basic and diluted earnings per share (in thousands, except per share amounts):


	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Net income from continuing operations	$	104,517	$	21,080	$	130,252	$	57,093
Net income from discontinued operations, net of tax	—		993		—		1,285
Net income	$	104,517	$	22,073	$	130,252	$	58,378

Weighted average common shares - basic	41,655		40,810		41,580		40,814
Dilutive effect of stock options and restricted stock units	2,017		735		1,976		872
Weighted average common shares - diluted	43,672		41,545		43,556		41,686

Basic earnings per share:
Continuing operations	$	2.51	$	0.52	$	3.13	$	1.40
Discontinued operations	—		0.02		—		0.03
Basic earnings per share	$	2.51	$	0.54	$	3.13	$	1.43

Diluted earnings per share:
Continuing operations	$	2.39	$	0.51	$	2.99	$	1.37
Discontinued operations	—		0.02		—		0.03
Diluted earnings per share	$	2.39	$	0.53	$	2.99	$	1.40

Potential shares of common stock that would have the effect of increasing diluted earnings per share or decreasing diluted loss per share are considered to be anti-dilutive and as such, these shares are not included in calculating diluted earnings per share. For the three and six months ended June 30, 2021, there were 0.1 million and 0.1 million, respectively, and for the three and six months ended June 30, 2020, there were 2.3 million and 1.7 million, respectively, of potential shares of common stock excluded from the calculation of diluted earnings per share because their effect was anti-dilutive.

The Company utilizes the "control number" concept in the computation of diluted earnings per share to determine whether potential common stock instruments are dilutive. The control number used is income from continuing operations. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss, regardless of their anti-dilutive effect on such categories.