Quarterly report pursuant to Section 13 or 15(d)

Debt Instruments (Tables)

v3.8.0.1
Debt Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt Long-term debt, net consisted of the following:

 
As of December 31,
 
As of March 31,
 
2017
 
2018
 
(in thousands)
1.75% convertible senior notes due 2020
$
345,000

 
$
345,000

Unamortized discount and deferred issuance costs
(71,986
)
 
(66,590
)
Long-term debt, net
$
273,014

 
$
278,410

Summary of the effective interest rate, contractually stated interest expense and costs related to amortization of discount for the Notes The following table outlines the effective interest rate, contractually stated interest expense and costs related to the amortization of the discount for the Notes:

 
Three months ended 
 March 31,
 
2017
 
2018
 
(in thousands except for effective interest rate)
Effective interest rate
10.18
%
 
10.18
%
Contractually stated interest expense
$
1,514

 
$
1,509

Amortization of discount
$
4,886

 
$
5,397