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Convertible Notes (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
As of December 31, 2018
1.375% Convertible Senior Notes due 2023
$
172,500

 
$
172,500

Unamortized discount - 2023 Notes
(22,163
)
 
(28,517
)
Unamortized debt issuance costs - 2023 Notes
(1,549
)
 
(2,049
)
Total convertible notes
$
148,788

 
$
141,934

Less current portion
—

 
—

Total long-term convertible notes
$
148,788

 
$
141,934
Schedule of interest expense on notes
Interest expense related to the notes for the years ended December 31, 2019, 2018 and 2017 was as follows:
 
Years Ended December 31,
 
2019
 
2018
 
2017
 
(in thousands)
2023 Notes coupon interest at a rate of 1.375%
$
2,372

 
$
2,372

 
$
290

2023 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 4.9%
6,854

 
6,486

 
768

2018 Notes coupon interest at a rate of 1.125%
—

 
377

 
1,488

2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5%
—

 
2,756

 
6,810

Total interest expense on convertible notes
$
9,226

 
$
11,991

 
$
9,356