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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Issuance of Common Stock (in shares) 28,529 30,436
Dividends paid on common stock (in dollars per shares) $ 0.40 $ 0.38
Treasury Stock, Shares, Acquired 90,300 0