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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Long-Term Debt
Long-term debt includes the following:
 
September 30,
2016
 
September 30,
2015
 
December 31,
2015
 
(In thousands)
2010 Senior Notes due October 2020 and October 2040
$
500,000

 
$
500,000

 
$
500,000

2011 Senior Notes due November 2016 and November 2041
600,000

 
600,000

 
600,000

2013 Senior Notes due March 2018 and March 2023
500,000

 
500,000

 
500,000

2014 Senior Notes due May 2019
500,000

 
500,000

 
500,000

2016 Senior Notes due August 2021
350,000

 
—

 
—

Debt issuance costs
(16,511
)
 
(15,985
)
 
(15,279
)
 
2,433,489

 
2,084,015

 
2,084,721

Less: current portion
(300,000
)
 
—

 
(300,000
)
Total long-term debt
$
2,133,489

 
$
2,084,015

 
$
1,784,721