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Convertible Notes (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table.
(Dollars in thousands)
As of December 31, 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
(22,911
)
 
(28,371
)
Unamortized discount - 2014 Notes
—

 
(8,453
)
Total unamortized discount
$
(22,911
)
 
$
(36,824
)
Total convertible notes
$
115,089

 
$
273,676

Less current portion
—

 
164,047

Total long-term convertible notes
$
115,089

 
$
109,629
Schedule of interest expense on notes
Interest expense related to the notes for the years ended December 31, 2014, 2013 and 2012 was as follows:
 
Years Ended December 31,
 
2014
 
2013
 
2012
 
(in thousands)
2018 Notes coupon interest at a rate of 1.125%
$
1,567

 
$
582

 
$
—

2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5%
$
6,019

 
2,171

 
—

2014 Notes coupon interest at a rate of 5%
3,929

 
8,625

 
8,625

2014 Notes amortization of discount at an additional effective interest rate of 11.7%
8,744

 
17,126

 
14,695

Total interest expense on convertible notes
$
20,259

 
$
28,504

 
$
23,320