Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

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 June 30,				For the Six Months Ended June 30,
	2020		2019		2020		2019
	(In thousands, except per share data)
Net income (loss) attributable to Amkor common stockholders	$	55,424	$	(9,450)	$	119,313	$	(32,329)
Weighted-average number of common shares outstanding - basic	241,098		239,508		241,009		239,461
Effect of dilutive securities:
Stock options and restricted share awards	312		—		336		—
Weighted-average number of common shares outstanding - diluted	241,410		239,508		241,345		239,461
Net income (loss) attributable to Amkor per common share:
Basic	$	0.23	$	(0.04)	$	0.50	$	(0.14)
Diluted	0.23		(0.04)		0.49		(0.14)

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 June 30,		For the Six Months Ended June 30,
	2020	2019	2020	2019
	(In thousands)
Stock options and restricted share awards	4,260	7,618	4,260	7,618