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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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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

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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