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Condensed Consolidated Statements of Equity (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 19, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]          
Dividends per common share (in usd per share) $ 0.06 $ 0.06 $ 0.08 $ 0.24 $ 0.24