15. Earnings Per Share

Details of the calculation of basic and diluted earnings per share are shown below:



	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
	(Dollars in thousands, except per share amounts)
Basic earnings per share computation:
Net income attributable to Ferro Corporation common shareholders	$	29,668	$	21,025	$	53,059	$	42,923
Weighted-average common shares outstanding		84,341		83,673		84,284		83,602
Basic earnings per share attributable to Ferro Corporation common shareholders	$	0.35	$	0.25	$	0.63	$	0.51
Diluted earnings per share computation:
Net income attributable to Ferro Corporation common shareholders	$	29,668	$	21,025	$	53,059	$	42,923
Weighted-average common shares outstanding		84,341		83,673		84,284		83,602
Assumed exercise of stock options		791		677		818		599
Assumed satisfaction of restricted stock unit conditions		281		425		271		376
Assumed satisfaction of performance stock unit conditions		176		502		172		503
Weighted-average diluted shares outstanding		85,589		85,277		85,545		85,080
Diluted earnings per share attributable to Ferro Corporation common shareholders	$	0.35	$	0.25	$	0.62	$	0.50

The number of anti-dilutive or unearned shares was 1.7 million and 1.7 million for the three and six months ended June 30, 2018, respectively, and 1.8 million and 1.9 million for the three and six months ended June 30, 2017. These shares were excluded from the calculation of diluted earnings per share due to their anti-dilutive impact.