Income Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Weighted Average Number of Shares Outstanding Used to Compute Income Per Share

The weighted average numbers of shares outstanding used to compute income per share were as follows (in thousands):



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Shares used to calculate basic income per share	30,193	30,755	30,253	30,734
Dilutive effect of outstanding stock options, performance stock units and restricted stock units	283	340	280	376
Shares used to calculate diluted income per share	30,476	31,095	30,533	31,110

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

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 June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Stock options	5	7	11	8
Restricted stock units	—	—	2	—