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Stockholders' Equity (Details 2) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
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 37,486,000 37,373,000 37,486,000 37,373,000
Effect of using weighted average common shares outstanding 66,000 264,000 (55,000) 269,000
Shares used in computing earnings per share - basic 37,552,000 37,637,000 37,431,000 37,642,000
Effect of shares issuable under stock option plans based on the treasury stock method 277,000 129,000 266,000 153,000
Effect of restricted shares 178,000 158,000 147,000 122,000
Shares used in computing earnings per share - diluted 38,007,000 37,924,000 37,844,000 37,917,000