Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Convertible Debt

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

	June 30, 2015
Liability component
Principal	$	1,437,500
Less: note discount	(128,648		)
Net carrying amount	1,308,852
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				Six Months Ended
	June 30,				June 30,
	2015		2014		2015		2014
Contractual interest expense	$	1,797	$	1,198	$	3,594	$	1,198
Amortization of debt issuance costs	992		611		1,974		611
Amortization of debt discount	7,980		5,169		15,900		5,169
	$	10,769	$	6,978	$	21,468	$	6,978