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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
Long-term debt includes the following:
 
March 31,
2018
 
March 31,
2017
 
December 31,
2017
 
(In thousands)
2010 Senior Notes due October 2020 and October 2040
$
500,000

 
$
500,000

 
$
500,000

2011 Senior Notes due November 2041
300,000

 
300,000

 
300,000

2013 Senior Notes due March 2018 and March 2023
250,000

 
500,000

 
500,000

2014 Senior Notes due May 2019
500,000

 
500,000

 
500,000

2016 Senior Notes due August 2021
350,000

 
350,000

 
350,000

2017 Senior Notes due December 2025
1,000,000

 
—

 
1,000,000

Debt issuance costs and debt discount
(28,229
)
 
(15,018
)
 
(26,881
)
 
2,871,771

 
2,134,982

 
3,123,119

Less: current portion
—

 
(250,000
)
 
(250,000
)
Total long-term debt
$
2,871,771

 
$
1,884,982

 
$
2,873,119