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Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]        
Dividends paid (in dollars per share) $ 0.11 $ 0.10 $ 0.22 $ 0.20