Subsequent Events (Details) - Subsequent Event.	Nov. 02, 2016 USD ($) $ / shares shares
Subsequent Events
Net proceeds from public offerings of Shares and Notes	$ 316,200,000
3.25% Convertible Senior Notes due 2023
Subsequent Events
Aggregate principal amount	$ 230,000,000
Interest rate (as a percent)	3.25%
Conversion rate	29.0276
Principal amount for considering conversion rate	$ 1,000
Conversion price (in dollars per share) | $ / shares	$ 34.45
Ordinary Shares | Underwritten public offerings
Subsequent Events
Sale of ordinary shares (in shares) | shares	3,850,000
Share price (in dollars per share) | $ / shares	$ 26.00