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CONSOLIDATED STATEMENTS OF CHANGES IN COMMON STOCK EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dividends per Common Share $ 1.40 $ 1.38 $ 1.38
Common stock, shares issued 36,265 38,020 39,559