Income Per Share

9 Months Ended

Sep. 30, 2018

INCOME PER SHARE

Basic per share amounts were computed using the weighted average number of common shares outstanding. Diluted per share amounts were calculated using the number of basic weighted average shares outstanding increased by dilutive potential common shares related to stock-based awards, as determined by the treasury stock method. The weighted average numbers of shares outstanding used to compute income per share were as follows (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Shares used to calculate basic income per share	30,185	30,749	30,230	30,739
Dilutive effect of outstanding stock options, performance stock units and restricted stock units	248	326	270	359
Shares used to calculate diluted income per share	30,433	31,075	30,500	31,098

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. In the case of stock options, this is because the average market price did not exceed the exercise price. In the case of restricted stock units, this is because unrecognized compensation expense exceeds the current value of the awards (i.e., grant date market value was higher than current average market price). These shares may be dilutive potential common shares in the future (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Stock options	9	7	10	8
Restricted stock units	1	—	—	—