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Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred shares, par value per share $ 0.01 $ 0.01
Preferred shares, authorized 50,000,000 50,000,000
Preferred shares, outstanding 0 0
Ordinary shares, par value per share $ 0.01 $ 0.01
Ordinary shares, authorized 1,200,000,000 1,200,000,000
Ordinary shares, outstanding 264,097,440 265,839,794