(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 June 30,		Six Months Ended June 30,
	2019	2018	2019	2018

Shares used in basic earnings per share calculation	46,318	46,016	46,261	45,944
Effect of dilutive securities:
Stock options	—	9	—	9
Restricted stock units	366	374	375	469
Performance-based restricted stock units	—	2	—	2
Total effects of dilutive securities	366	385	375	480
Shares used in dilutive earnings per share calculation	46,684	46,401	46,636	46,424

For the three months ended June 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 six months ended June 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 June 30, 2019 and 2018, there were restricted stock units (“RSUs”) of 10 thousand and 113 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 six months ended June 30, 2019 and 2018, there were RSUs of 20 thousand and 64 thousand, respectively, outstanding which were excluded from the computation of diluted net income per share because the effect would have been anti-dilutive.