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UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Dividends per share (USD per share) $ 0.01 $ 0.01 $ 0.02 $ 0.02