Below are the computations of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017:

(In thousands, except per share amounts)	Three Months Ended June 30				Six Months Ended June 30
	2018		2017		2018		2017
Computation of Basic Earnings per Share
Net income attributable to Stepan Company	$	32,925	$	27,882	$	63,648	$	59,795
Weighted-average number of common shares outstanding		23,039		22,953		23,059		22,927
Basic earnings per share	$	1.43	$	1.21	$	2.76	$	2.61

Computation of Diluted Earnings per Share
Net income attributable to Stepan Company	$	32,925	$	27,882	$	63,648	$	59,795
Weighted-average number of shares outstanding		23,039		22,953		23,059		22,927
Add weighted-average net shares from assumed exercise of options (under treasury stock method) ⁽¹⁾		87		172		103		177
Add weighted-average net shares related to unvested stock awards (under treasury stock method)		2		8		2		8
Add weighted-average net shares from assumed exercise of SARs (under treasury stock method) ⁽¹⁾		99		143		111		143
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury stock method)		68		105		66		101
Weighted-average shares applicable to diluted earnings		23,295		23,381		23,341		23,356
Diluted earnings per share	$	1.41	$	1.19	$	2.73	$	2.56

⁽¹⁾ Options/SARs to acquire 194,949 and 98,878 shares of Company common stock were excluded from the computations of diluted earnings per share for the three- and six- months ended June 30, 2018, respectively. Options/SARs to acquire 37,261 shares of Company common stock were excluded from the computations of diluted earnings per share for the six months ended June 30, 2017. Inclusion of the instruments would have had antidilutive effects on the computations of the earnings per share.