Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

The following table summarizes the computation of basic and diluted EPS:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2019		2018		2019		2018
	(In thousands, except per share data)
Net income attributable to Amkor common stockholders	$	54,070	$	56,662	$	21,741	$	98,797
Weighted-average number of common shares outstanding — basic	239,586		239,370		239,503		239,312
Effect of dilutive securities:
Stock options and restricted share awards	351		396		355		471
Weighted-average number of common shares outstanding — diluted	239,937		239,766		239,858		239,783
Net income attributable to Amkor per common share:
Basic	$	0.23	$	0.24	$	0.09	$	0.41
Diluted	0.23		0.24		0.09		0.41

Summary of potential shares of common stock excluded from diluted earnings per share

The following table summarizes the potential shares of common stock that were excluded from diluted EPS because the effect of including these potential shares was anti-dilutive:

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
	2019	2018	2019	2018
	(In thousands)
Stock options and restricted share awards	6,347	3,656	6,487	3,544