Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2016

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,
	2016		2015		2016		2015
	(In thousands, except per share data)
Net income attributable to Amkor	$	60,089	$	27,735	$	63,927	$	61,660
Income allocated to participating securities	—		—		—		(94		)
Net income available to Amkor common stockholders	$	60,089	$	27,735	$	63,927	$	61,566
Weighted average shares outstanding — basic	237,353		236,888		237,157		236,813
Effect of dilutive securities:
Stock options and restricted share awards	839		86		429		355
Weighted average shares outstanding — diluted	238,192		236,974		237,586		237,168
Net income attributable to Amkor per common share:
Basic	$	0.25	$	0.12	$	0.27	$	0.26
Diluted	0.25		0.12		0.27		0.26

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 September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
	(In thousands)
Stock options and restricted share awards	1,284	3,477	2,020	1,861