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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.28 $ 0.24
Common stock (purchased) sold by directors' deferred compensation plan (in net shares) 5,000 8,159
Shares of common stock repurchased 492,922 3,950,781