NET INCOME PER SHARE

The Company computes basic net income per share by dividing net income applicable to common shareholders 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,
	2018	2017	2018	2017
Weighted-average number of basic common shares outstanding	48,055	49,131	48,202	49,161
Weighted-average dilutive stock options, restricted stock units and performance share units	198	206	240	221
Assumed conversion of Convertible Senior Notes	297	719	435	667
Weighted-average number of diluted common and common equivalent shares outstanding	48,550	50,056	48,877	50,049
Anti-dilutive potential common shares	1,431	2,075	1,410	2,118

Anti-dilutive potential common shares for the three and six months ended June 30, 2018 include approximately 1.0 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.