NET INCOME PER SHARE

6 Months Ended

Jun. 30, 2019

The Company computes basic net income per share by dividing net income applicable to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net income per share is based upon the weighted-average number of common and common equivalent shares outstanding during the period.

Common equivalent shares related to stock options, restricted stock units, and performance share units are calculated using the treasury stock method. Performance share units are included in the weighted-average common equivalent shares based on the number of shares that would be issued if the end of the reporting period were the end of the performance period, if the result would be dilutive.

The Company's convertible notes have net share settlement features requiring the Company upon conversion to settle the principal amount of the debt for cash and the conversion premium for cash or shares of the Company's common stock, at the Company's option. The convertible notes are included in the calculation of diluted net income per share if their inclusion is dilutive under the treasury stock method.

A reconciliation of the weighted-average number of shares outstanding used in calculating diluted earnings per share is as follows (in thousands):



	Three Months Ended June 30,		Six Months Ended June 30,
	2019	2018	2019	2018
Weighted-average number of basic common shares outstanding	43,251	48,055	44,124	48,202
Weighted-average dilutive stock options, restricted stock units and performance share units	146	198	188	240
Assumed conversion of Convertible Senior Notes	204	297	202	435
Weighted-average number of diluted common and common equivalent shares outstanding	43,601	48,550	44,514	48,877
Anti-dilutive potential common shares	1,304	1,431	1,265	1,410

Anti-dilutive potential common shares for both the three and six months ended June 30, 2019 included approximately 1 million shares that could be issued under the Company's outstanding convertible notes. Under the treasury stock method, the convertible notes will generally have an anti-dilutive impact on net income per share if the conversion prices for the convertible notes exceed the Company's average stock price.