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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Common Stock Dividends Per Share Declared [Abstract]    
Common Stock, Dividends, Per Share, Declared $ 0.60 $ 0.40
Less: net loss attributable to redeemable noncontrolling interests $ (33,000) $ 0