Convertible Notes (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Schedule of convertible notes

The Company’s convertible notes are shown in the following table:

(In thousands)	As of June 30, 2014			As of December 31, 2013
1.125% Convertible Senior Notes due 2018	$	138,000		$	138,000
5% Convertible Senior Notes due 2014	—			172,500
Total principal amount of convertible notes	$	138,000		$	310,500
Unamortized discount - 2018 Notes	$	(25,684	)	$	(28,371	)
Unamortized discount - 2014 Notes	—			(8,453		)
Total unamortized discount	$	(25,684	)	$	(36,824	)
Total convertible notes	$	112,316		$	273,676
Less current portion	—			164,047
Total long-term convertible notes	$	112,316		$	109,629

Schedule of interest expense on notes

Interest expense related to the notes for the three and six months ended June 30, 2014 and 2013 was as follows:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
	(In thousands)
2014 Notes coupon interest at a rate of 5%	$	1,773	$	2,156	$	3,929	$	4,313
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7%	3,975		4,145		8,744		8,234
2018 Notes coupon interest at a rate of 1.125%	388		—		776		—
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5%	1,494		—		2,967		—
Total interest expense on convertible notes	$	7,630	$	6,301	$	16,416	$	12,547