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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Stockholders' equity        
Share capital, par value (in dollars per share) $ 0.01 $ 0.01    
Share capital, shares authorized (in shares) 200,000,000 200,000,000    
Share capital, shares issued (in shares) 119,375,525 119,373,064    
Share capital, shares outstanding (in shares) 119,375,525 119,373,064 119,373,064 110,930,873