DEBT (Tables)

3 Months Ended

Mar. 31, 2015

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 March 31, 2015 (in thousands):

Net carrying amount of the liability component	$	233,057
Unamortized discount of the liability component	111,943
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 three months ended March 31, 2015 (in thousands):

Stated coupon interest	$	2,156
Amortization of debt discount and debt issuance costs	3,421
Total interest expense	$	5,577