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Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Common Stock [Member]
   
Number of warrants exercised into shares 186,589,000  
Common Stock [Member] | Exercise of Series C Warrants [Member]
   
Number of warrants exercised into shares 407,542,000  
Retained Earnings [Member]
   
Common stock per share dividend amount $ 1.40 $ 1.40