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Stockholders' Equity (Details 2) (USD $)
 3 Months Ended 9 Months Ended 67 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
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 37,125,000 37,134,000 37,125,000 37,134,000    
Effect of using weighted average common shares outstanding 30,000 191,000 1,000 362,000    
Shares used in computing earnings per share - basic 37,155,000 37,325,000 37,126,000 37,496,000    
Effect of shares issuable under stock option plans based on the treasury stock method 90,000   91,000      
Effect of contingently issuable restricted shares 87,000   48,000      
Shares used in computing earnings per share - diluted 37,332,000 37,325,000 37,265,000 37,496,000    
Number of shares of unvested contingently issuable restricted stock outstanding 200,000 400,000 200,000 400,000 200,000  
Share Repurchase Program            
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program 6,600,000   6,600,000   6,600,000 1,000,000
Number of shares of common stock repurchased         5,800,000  
Average price (in dollars per share)     $ 9.85   $ 10.95