NET INCOME PER SHARE

12 Months Ended

Dec. 31, 2015

(18)NET INCOME PER SHARE

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


	Year Ended December 31,
	2015	2014	2013

Shares used in basic earnings per share calculation	48,370	49,297	51,338
Effect of dilutive securities:
Stock options	275	413	417
Restricted stock units	338	392	489
Performance-based restricted stock units	28	—	—
Total effects of dilutive securities	641	805	906
Shares used in dilutive earnings per share calculation	49,011	50,102	52,244

For the years ended December 31, 2015, 2014 and 2013, 0.1 million, 0.1 million and 0.1 million, respectively, of options to purchase shares of common stock were outstanding but not included in 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 years ended December 31, 2015, 2014 and 2013, restricted stock units of 0.4 million, 0.2 million, and 0.2 million, respectively, were outstanding but not included in the computation of diluted net income per share because the effect would have been anti-dilutive. For the years ended December 31, 2015, 2014 and 2013, there were no performance-based restricted stock units outstanding but not included in the computation of diluted net income per share. For the years ended December 31, 2015, 2014 and 2013, restricted stock units that vest based on the Company achieving specified operating income performance targets of 0.1 million, 0.1 million and 0.1 million, respectively, were outstanding but not included in the computation of diluted net income per share because they were determined not to be contingently issuable.