Convertible Notes (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Schedule of convertible notes

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

(In thousands)	As of March 31, 2014			As of December 31, 2013
5% Convertible Senior Notes due 2014	$	172,500		$	172,500
1.125% Convertible Senior Notes due 2018	138,000			138,000
Total principal amount of convertible notes	$	310,500		$	310,500
Unamortized discount - 2014 Notes	$	(3,842	)	$	(8,453	)
Unamortized discount - 2018 Notes	(27,038		)	(28,371		)
Total unamortized discount	$	(30,880	)	$	(36,824	)
Total convertible notes	$	279,620		$	273,676
Less current portion	168,658			164,047
Total long-term convertible notes	$	110,962		$	109,629

Schedule of interest expense on notes

Interest expense related to the notes for the three months ended March 31, 2014 and 2013 was as follows:

	Three Months Ended
	March 31,
	2014		2013
	(In thousands)
2014 Notes coupon interest at a rate of 5%	$	2,156	$	2,157
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7%	4,769		4,089
2018 Notes coupon interest at a rate of 1.125%	388		—
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5%	1,473		—
Total interest expense on convertible notes	$	8,786	$	6,246