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Consolidated Statements of Changes in Shareholders Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dividends, per share $ 0.40 $ 0.28 $ 0.12
Retained Earnings
     
Dividends, per share $ 0.40 $ 0.28 $ 0.12
Noncontrolling Interests
     
Dividends, per share $ 0.40 $ 0.28 $ 0.12