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Debt And Interest Expense (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
The following table summarizes information related to our Senior notes (in thousands, except interest rates):
 
 
 
 
 
As of December 31,
 
 
 
 
 
2018
 
2017
 
 
Issuance Date
Maturity Date
Interest Rate
Principal
Senior notes due 2023
 
April 16, 2013
May 1, 2023
4.625
%
$
750,000

 
$
750,000

Senior notes due 2025
 
March 27, 2015
April 1, 2025
5.250
%
500,000

 
500,000

Senior notes due 2027
 
July 5, 2017
July 15, 2027
4.750
%
550,000

 
550,000

Unamortized issuance costs
 
 
 
 
(14,953
)
 
(17,471
)
Total senior notes
 
 
 
 
$
1,785,047

 
$
1,782,529
Carrying amounts of liability and equity components [Table Text Block]
The table below presents the carrying amounts of the liability and equity components as of December 31, 2017.
Debt discount upon issuance (net of issuance costs of $14,449)
$
686,221

Deferred taxes associated with the debt discount upon issuance
(267,225
)
Carrying amount of equity component
$
418,996

 
 
Principal amount of Subordinated Convertible Debentures
$
1,250,000

Unamortized discount of liability component
(612,303
)
Unamortized debt issuance costs associated with the liability component
(10,081
)
Carrying amount of liability component
$
627,616
Schedule of Components of Interest Expense
The following table presents the components of the Company’s interest expense:
 
Year Ended December 31,
2018
 
2017
 
2016
 
(In thousands)
Contractual interest on Subordinated Convertible Debentures
$
20,015

 
$
47,432

 
$
40,625

Contractual interest on Senior Notes
87,063

 
73,638

 
60,938

Amortization of debt discount on the Subordinated Convertible Debentures
4,236

 
12,012

 
11,094

Amortization of debt issuance costs and other interest expense
3,531

 
3,254

 
2,907

Total interest expense
$
114,845

 
$
136,336

 
$
115,564