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Shareholders' Equity (Details) (USD $)
 1 Months Ended 12 Months Ended
Nov. 30, 2011
Apr. 30, 2008
Dec. 31, 2011
Vote
Dec. 31, 2009
Dec. 05, 2008
Right
Shareholders' Equity (Textual) [Abstract]          
Authorized shares     400,000    
Preferred stock Par value     $ 0.01    
Preferred stock issued     0    
Vote entitled for each common share outstanding     1    
Number of preferred stock purchase right for dividend distribution.         1
Outstanding common share to be acquiring person     15.00%    
Repurchase of authorized common stock $ 80,000,000 $ 50,000,000      
Repurchase of shares     1,375,875    
Repurchase of shares, Value     30,000,000    
Number of shares included under repurchase program     337,078    
Value of shares included under repurchase program     10,000,000    
Remaining repurchase authorization amount $ 20,000,000        
Common stock purchase at fair market value       95.00%  
Number of months for holding common stock       3 months  
Number of Shares Purchased under employee stock purchase plan       9,763