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Stockholders' Equity (Details 2) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 37,550,000 37,748,000 37,550,000 37,748,000
Effect of using weighted average common shares outstanding (93,000) (42,000) (180,000) (104,000)
Shares used in computing earnings per share - basic 37,457,000 37,706,000 37,370,000 37,644,000
Effect of shares issuable under stock option plans based on the treasury stock method 289,000 144,000 260,000 165,000
Effect of restricted shares 171,000 30,000 131,000 105,000
Shares used in computing earnings per share - diluted 37,917,000 37,880,000 37,761,000 37,914,000