Net Income Per Share

6 Months Ended

Jun. 30, 2020

Basic net income per share is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted net income per share is computed using the weighted average number of common shares outstanding and, when dilutive, common share equivalents from outstanding stock options and restricted stock units (using the treasury-stock method), and potential common shares from the Company’s convertible notes (using the if-converted method). The weighted-average number of common shares used in the computation of basic and diluted net income per share were as follows:


	Three Months Ended June 30,			Six Months Ended June 30,
(in millions)	2020	2019	2020	2019
Weighted average number of common shares outstanding, basic	64,370,791	59,844,991	63,627,231	59,601,365
Stock options	1,086,474	1,479,713	1,129,985	1,513,886
Restricted stock units	121,248	161,621	212,971	217,200
Weighted average number of common shares outstanding, diluted	65,578,513	61,486,325	64,970,187	61,332,451

The number of common share equivalents excluded from the computation of diluted net income per share because either the effect would have been anti-dilutive, or the performance criteria related to the units had not yet been met, were as follows:


	Three Months Ended June 30,			Six Months Ended June 30,
	2020	2019	2020	2019
1.25% Convertible Senior Notes	—	5,910,954	—	5,910,954
1.375% Convertible Senior Notes	4,319,429	4,319,429	4,319,429	4,319,429
0.375% Convertible Senior Notes	3,528,400	—	3,528,400	—
Unvested restricted stock units	298,600	426,550	356,577	421,776
Stock options	66,855	181,132	52,069	231,289
Total	8,213,284	10,838,065	8,256,475	10,883,448