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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Common stock purchased by directors' deferred compensation plan (in shares) 8,159 1,118 1,782
Cash dividends (in dollars per share) $ 0.82 $ 0.36 $ 0.16
Shares of common stock repurchased (in shares) 4,122,881 7,045,620