Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

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,
	2017		2016		2017		2016
	(In thousands, except per share data)
Net income available to Amkor common stockholders	$	115,507	$	4,713	$	105,501	$	3,838
Weighted-average number of common shares outstanding — basic	238,863		237,090		238,774		237,058
Effect of dilutive securities:
Stock options and restricted share awards	816		344		827		239
Weighted-average number of common shares outstanding — diluted	239,679		237,434		239,601		237,297
Net income attributable to Amkor per common share:
Basic	$	0.48	$	0.02	$	0.44	$	0.02
Diluted	0.48		0.02		0.44		0.02

Antidilutive effect of potential shares of common stock that were 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,
	2017	2016	2017	2016
	(In thousands)
Stock options and restricted share awards	3,193	2,005	3,473	2,025