Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity

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):

	Year Ended December 31,
	2020	2019	2018
Common shares outstanding, end of period	36,188	36,658	36,894
Effect of using weighted average common shares outstanding	354	196	308
Shares used in computing earnings per share—basic	36,542	36,854	37,202
Effect of shares issuable under stock option plans based on the treasury stock method	123	204	283
Effect of restricted and contingently issuable shares	73	73	107
Shares used in computing earnings per share—diluted	36,738	37,131	37,592