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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Common stock purchased by directors' deferred compensation plan (in shares) 22,800 8,159 1,118
Cash dividends (in dollars per share) $ 0.60 $ 0.82 $ 0.36
Shares of common stock repurchased (in shares) 796,822 4,122,881 7,045,620