Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Convertible Debt

The Convertible Notes consist of the following (in thousands):

	September 30, 2015
Liability component
Principal	$	1,437,500
Less: note discount	(120,608		)
Net carrying amount	1,316,892
Equity component *	$	162,869

* Recorded in the condensed consolidated balance sheet within additional paid-in capital.

Schedule of Interest Expense Recognized Related to Convertible Notes

The following table includes total interest expense recognized related to the Convertible Notes (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Contractual interest expense	$	1,797	$	1,797	$	5,391	$	2,995
Amortization of debt issuance costs	997		922		2,971		1,533
Amortization of debt discount	8,039		7,802		23,939		12,971
	$	10,833	$	10,521	$	32,301	$	17,499