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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dividends, per share $ 0.40 $ 0.40 $ 0.28
Common Stock [Member]
     
Dividends, per share $ 0.40 $ 0.40 $ 0.28