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Convertible Notes (Narrative) (Details 3) - $ / shares	Nov. 17, 2017	Nov. 14, 2017
Debt instrument
Class of warrant or right, exercise price of warrants or rights		$ 23.30
1.375% Convertible senior notes due 2023 | Convertible senior notes
Debt instrument
Initial conversion price of notes (in dollars per share)	$ 18.93

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