Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Reconciliation of number of shares outstanding with the number of shares used in computing basic and diluted earnings per share

The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands):

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2019	2018	2019	2018
Common shares outstanding, end of period	36,854	37,246	36,854	37,246
Effect of using weighted average common shares outstanding	89	(26)	79	(40)
Shares used in computing earnings per share—basic	36,943	37,220	36,933	37,206
Effect of shares issuable under stock option plans based on the treasury stock method	221	309	226	341
Effect of restricted and contingently issuable shares	59	76	69	70
Shares used in computing earnings per share—diluted	37,223	37,605	37,228	37,617