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Debt And Interest Expense (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
 
 
 
 
2017
 
2016
 
 
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

 
—

Unamortized issuance costs
 
 
 
 
(17,471
)
 
(12,811
)
Total senior notes
 
 
 
 
$
1,782,529

 
$
1,237,189
Proceeds upon issuance of the Convertible Debentures
Proceeds upon issuance of the Subordinated Convertible Debentures were as follows (in thousands):
Principal value of Subordinated Convertible Debentures
 
$
1,250,000

Less: Issuance costs
 
(25,777
)
Net proceeds, Subordinated Convertible Debentures
 
$
1,224,223

Amounts recognized at issuance:
 
 
Subordinated Convertible Debentures, including contingent interest derivative (net of issuance costs of $11,328)
 
$
546,915

Additional paid-in capital
 
418,996

Long-term deferred tax liabilities
 
267,225

Non-operating loss
 
(8,913
)
Net proceeds, Subordinated Convertible Debentures
 
$
1,224,223
Schedule of Carrying Amounts of Liability and Equity Components
The table below presents the carrying amounts of the liability and equity components:
 
As of December 31,
 
2017
 
2016
 
(In thousands)
Debt discount upon issuance (net of issuance costs of $14,449)
$
686,221

 
$
686,221

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

 
$
418,996

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

 
$
1,250,000

Unamortized discount of liability component
(612,303
)
 
(624,315
)
Unamortized debt issuance costs associated with the liability component
(10,081
)
 
(10,260
)
Carrying amount of liability component
627,616

 
615,425

Contingent interest derivative
—

 
14,339

Subordinated Convertible Debentures, including contingent interest derivative
$
627,616

 
$
629,764
Schedule of Components of Interest Expense
The following table presents the components of the Company’s interest expense:
 
Year Ended December 31,
2017
 
2016
 
2015
 
(In thousands)
Contractual interest on Subordinated Convertible Debentures
$
47,432

 
$
40,625

 
$
40,625

Contractual interest on Senior Notes
73,638

 
60,938

 
54,667

Amortization of debt discount on the Subordinated Convertible Debentures
12,012

 
11,094

 
10,218

Amortization of debt issuance costs and other interest expense
3,254

 
2,907

 
2,121

Total interest expense
$
136,336

 
$
115,564

 
$
107,631