Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017	2016	2015
Common shares outstanding, end of period	37,187	37,209	37,427
Effect of using weighted average common shares outstanding	52	126	15
Shares used in computing earnings per share—basic	37,239	37,335	37,442
Effect of shares issuable under stock option plans based on the treasury stock method	316	330	266
Effect of restricted and contingently issuable shares	117	146	160
Shares used in computing earnings per share—diluted	37,672	37,811	37,868