DEBT (Tables)

12 Months Ended

Dec. 31, 2014

Debt.

Summary of the liability component of the 2021 Notes

The following is a summary of the liability component of the 2021 Notes as of December 31, 2014 (in thousands):

	2014
Net carrying amount of the liability component	$	229,891
Unamortized discount of the liability component		115,109
Principal amount of the 2021 Notes	$	345,000

Summary of interest expense for the 2021 Notes

The debt discount and debt issuance costs will be amortized as interest expense through September 2021. The following is a summary of interest expense for the 2021 Notes at December 31, 2014 (in thousands):

	2014
Stated coupon interest	$	2,683
Amortization of debt discount and debt issuance costs		4,200
Total interest expense	$	6,883