Convertible Senior Notes ("Notes"), Note Hedges, and Warrants (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Schedule of Convertible Notes

The Notes consist of the following as of September 30, 2015 and December 31, 2014 (in thousands):

	September 30, 2015			December 31, 2014
Liability component	$	345,000		$	345,000
Less: debt discount, net of amortization		51,484			60,182
Net carrying amount	$	293,516		$	284,818
Equity component	$	63,643		$	63,643
Less: debt issuance costs allocated to equity		(1,582	)		(1,582	)
Net carrying amount	$	62,061		$	62,061

Summary of Interest Expense Recognized Related to Notes

Interest expense recognized related to the Notes during the three and nine months ended September 30, 2015 was as follows (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2015		2014		2015		2014
0.75% coupon	$	654	$	151	$	1,948	$	151
Amortization of debt issuance costs		354		79		1,042		79
Amortization of debt discount		2,961		658		8,698		658
	$	3,969	$	888	$	11,688	$	888