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

 
$
21,403

 
$
65,297

 
$
51,872

Contractual interest on Subordinated Convertible Debentures
—

 
12,426

 
20,015

 
32,738

Amortization of debt discount on Subordinated Convertible Debentures
—

 
3,034

 
4,236

 
8,916

Amortization of debt issuance costs and other interest expense
865

 
893

 
2,663

 
2,343

Total interest expense
$
22,631

 
$
37,756

 
$
92,211

 
$
95,869