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Interest Expense (Tables)
 6 Months Ended
Jun. 30, 2017
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,
2017
 
2016
 
2017
 
2016
 
(In thousands)
Contractual interest on Subordinated Convertible Debentures
$
10,156

 
$
10,156

 
$
20,312

 
$
20,312

Contractual interest on Senior Notes
15,234

 
15,234

 
30,469

 
30,469

Amortization of debt discount on Subordinated Convertible Debentures
2,971

 
2,744

 
5,882

 
5,433

Amortization of debt issuance costs and other interest expense
729

 
725

 
1,450

 
1,449

Total interest expense
$
29,090

 
$
28,859

 
$
58,113

 
$
57,663