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Stockholders' Equity (Details 3) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share      
Common shares outstanding, end of period 37,427 37,270 37,578
Effect of using weighted average common shares outstanding 15 277 (333)
Shares used in computing earnings per share - basic 37,442 37,547 37,245
Effect of shares issuable under stock option plans based on the treasury stock method 266 147 183
Effect of contingently issuable restricted shares 160 103 108
Shares used in computing earnings per share - diluted 37,868 37,797 37,536