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Interest Expense (Tables)
 6 Months Ended
Jun. 30, 2018
Interest Expense [Abstract]  
Interest Expense Schedule
The following table presents the components of the Company’s interest expense:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
2018
 
2017
 
2018
 
2017
 
(In thousands)
Contractual interest on Senior Notes
$
21,766

 
$
15,234

 
$
43,531

 
$
30,469

Contractual interest on Subordinated Convertible Debentures
5,067

 
10,156

 
20,015

 
20,312

Amortization of debt discount on Subordinated Convertible Debentures
1,075

 
2,971

 
4,236

 
5,882

Amortization of debt issuance costs and other interest expense
884

 
729

 
1,798

 
1,450

Total interest expense
$
28,792

 
$
29,090

 
$
69,580

 
$
58,113