Earnings Per Share

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share

7. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common stockholders by the weighted average number of common shares outstanding during the period. The weighted average number of common shares outstanding includes restricted shares held by retirement eligible recipients and is reduced for treasury stock.

Diluted EPS is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, unvested restricted shares and convertible debt. The following table summarizes the computation of basic and diluted EPS:

	For the Year Ended December 31,
	2015			2014			2013
	(In thousands, except per share data)
Net income attributable to Amkor	$	56,812		$	130,386		$	109,296
Income allocated to participating securities	(65		)	(372		)	(681		)
Net income available to Amkor common stockholders — basic	56,747			130,014			108,615
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	—			6			93
Interest on 6.0% convertible notes due 2014, net of tax	—			1,039			9,440
Net income attributable to Amkor — diluted	$	56,747		$	131,059		$	118,148
Weighted average shares outstanding — basic	236,850			230,710			187,032
Effect of dilutive securities:
Stock options and restricted share awards	320			712			21
6.0% convertible notes due 2014	—			5,309			48,277
Weighted average shares outstanding — diluted	237,170			236,731			235,330
Net income attributable to Amkor per common share:
Basic	$	0.24		$	0.56		$	0.58
Diluted	0.24			0.55			0.50

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 antidilutive:

	For the Year Ended December 31,
	2015	2014	2013
	(In thousands)
Stock options and restricted share awards	1,858	1,303	4,890