Type	Name	Date
Indenture	Second Supplemental Indenture, between the Company and U.S. Bank National Association, as Trustee (including the form of 0.3750% Convertible Senior Notes due 2027)	03/08/2019
Indenture	Indenture, between the Company and U.S. Bank National Association, as Trustee	01/17/2018
Indenture	First Supplemental Indenture, between the Company and U.S. Bank National Association, as Trustee (including the form of 1.0% Convertible Senior Notes due 2025)	01/17/2018
Underwriting agreement	Underwriting Agreement	06/09/2017
Underwriting agreement	Underwriting Agreement	08/01/2016
Underwriting agreement	Underwriting Agreement	07/23/2015
Underwriting agreement	Underwriting Agreement	12/18/2014
Underwriting agreement	Underwriting Agreement	04/04/2014
Underwriting agreement	Underwriting Agreement	06/18/2013
Underwriting agreement	Underwriting Agreement	08/08/2012
Underwriting agreement	Underwriting Agreement	12/06/2011
Underwriting agreement	Underwriting Agreement	11/04/2010