(15)NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands):


	Three Months Ended September 30,		Nine Months Ended September 30,
	2019	2018	2019	2018

Shares used in basic earnings per share calculation	46,481	46,172	46,335	46,021
Effect of dilutive securities:
Stock options	—	6	—	8
Restricted stock units	287	138	358	360
Performance-based restricted stock units	—	—	—	1
Total effects of dilutive securities	287	144	358	369
Shares used in dilutive earnings per share calculation	46,768	46,316	46,693	46,390

For the three months ended September 30, 2019 and 2018, there were no options to purchase shares of common stock outstanding that were excluded from the computation of diluted net income per share because the exercise price exceeded the value of the shares and the effect would have been anti-dilutive. For the nine months ended September 30, 2019 and 2018, there were no options to purchase shares of common stock outstanding that were excluded from the computation of diluted net income per share because the exercise price exceeded the value of the shares and the effect would have been anti-dilutive. For the three months ended September 30, 2019 and 2018, there were restricted stock units (“RSUs”) of zero and 475 thousand, respectively, outstanding which were excluded from the computation of diluted net income per share because the effect would have been anti-dilutive. For the nine months ended September 30, 2019 and 2018, there were RSUs of 20 thousand and 168 thousand, respectively, outstanding which were excluded from the computation of diluted net income per share because the effect would have been anti-dilutive.