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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
Sep. 30, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Statement of Financial Position [Abstract]    
Preferred shares, nominal value (in usd per share) | $ / shares $ 0.01 $ 0.01
Preferred shares, shares authorized (in shares) 50,000,000 50,000,000
Preferred shares, shares issued (in shares) 0 0
Preferred shares, shares outstanding (in shares) 0 0
Ordinary shares, nominal value (in usd per share) | (per share) $ 0.01 $ 0.01
Ordinary shares, shares authorized (in shares) 500,000,000 500,000,000
Ordinary shares, shares issued (in shares) 42,420,000 41,463,000
Ordinary shares, shares outstanding (in shares) 37,012,000 39,346,000
Treasury stock, shares held (in shares) 5,408,000 2,117,000