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Stockholders' Equity (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 90 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Oct. 24, 2014
Mar. 29, 2007
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 37,373,000 37,296,000 37,373,000 37,296,000        
Effect of using weighted average common shares outstanding 264,000 (3,000) 269,000 (112,000)        
Shares used in computing earnings per share - basic 37,637,000 37,293,000 37,642,000 37,184,000        
Effect of shares issuable under stock option plans based on the treasury stock method 129,000 245,000 153,000 153,000        
Effect of contingently issuable restricted shares 158,000 93,000 122,000 107,000        
Shares used in computing earnings per share - diluted 37,924,000 37,631,000 37,917,000 37,444,000        
Number of shares of unvested contingently issuable restricted stock outstanding   100,000   100,000        
Share Repurchase Program                
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program 7,600,000   7,600,000     7,600,000 1,000,000 1,000,000
Minimum number of shares of common stock repurchased     400,000     6,400,000    
Share repurchased     $ 6,282   $ 1,832      
Average price (in dollars per share)     $ 14.73     $ 11.25