Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Convertible Debt

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

	March 31, 2016			December 31, 2015
Liability component
Principal	$	1,437,500		$	1,437,500
Less: note discount and issuance costs	(117,260		)	(126,429		)
Net carrying amount	1,320,240			1,311,071
Equity component *	$	162,869		$	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
	March 31,
	2016		2015
Contractual interest expense	$	1,797	$	1,797
Amortization of debt issuance costs	1,009		982
Amortization of debt discount	8,161		7,920
	$	10,967	$	10,699