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Income Per Share
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Income Per Share INCOME PER SHARE

The weighted average numbers of shares outstanding used to compute income per share amounts were as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Shares used for basic per share calculations
30,099

 
30,671

 
31,032

Dilutive effect of outstanding options, RSUs, and PSUs
256

 
339

 
269

Shares used for diluted per share calculations
30,355

 
31,010

 
31,301



The weighted average numbers of shares outstanding listed in the table below were anti-dilutive and excluded from the computation of diluted income per share, primarily because the average market price did not exceed the exercise price. These shares may be dilutive potential common shares in the future (in thousands):
 
As of December 31,
 
2018
 
2017
 
2016
Stock options
10

 
8

 
8

RSUs
1