XML 22 R47.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stockholders Rights Plan (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
May 31, 2009
Mar. 31, 2009
Stockholders Rights Plan [Abstract]        
Date of dividend declared May 28, 2003      
Dividends payable record date   Jun. 10, 2003    
Preferred stock, conversion basis one one-thousandth (1/1000th) of a share      
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001    
Original exercise price (in dollars per share) $ 25.00   $ 2.62 $ 2.59
Beneficial ownership (in hundredths) 15.00%      
Beneficial ownership for certain shareholders (in hundredths) 20.00%      
Number of days for commencement 10 days