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Stockholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
item
Nov. 11, 2012
Oct. 31, 2012
Dec. 31, 2011
Number of votes 100      
Percentage of one preferred share in one Right 1.00%      
Threshold of days following requirements for exercise Rights 10 days      
Redemption price per right   0.01    
Purchase price of preferred stock per Unit     $ 220  
Preferred stock, shares authorized 1,000,000     1,000,000
Plan Amendment [Member]
        
Purchase price of preferred stock per Unit     $ 80  
Class A Junior Participating Preferred Stock [Member]
        
Preferred stock, shares authorized 200,000   200,000 100,000
Class A Junior Participating Preferred Stock [Member] | Plan Amendment [Member]
        
Preferred stock, shares authorized     100,000  
Minimum [Member]
        
Threshold of common stock percentage for common stock diluted 15.00%      
Ownership percentage of common stock 15.00%      
Threshold of percentage of assets or earning power sold or transferred for merger 50.00%      
Threshold of beneficial ownership of outstanding common stock for the Rights exchanging 15.00%      
Threshold of prior acquisition common stock percentage for the Right exchanging 50.00%