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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dividend paid per share $ 5.00 $ 13.00 $ 10.00
Retained Earning (Accumulated Deficit)
     
Dividend paid per share $ 5.00 $ 13.00 $ 10.00