Annual report pursuant to Section 13 and 15(d)

Consolidated Statements Of Shareholders' Equity (Parenthetical)

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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Shareholders' Equity [Abstract]      
Cash dividends per share $ 0.86 $ 2.24 $ 0.66